Matthew 10:28, when translated honestly within the given context, should read, "And do not fear those who kill the body but cannot cause the soul to be killed: rather, fear the One who can cause both soul and body to be lost in Geenna."
First, This is talking about Lucifer, or the King of Tyrus, and it is not talking about the lake of fire at all. Notice how he wasn't thrown into any fire here? The fire was brought up from within him. Much different than what is happening in Revelation... Besides that, if you follow the line of thought in context with a little etymology, you would find that an accurate translation would be, "You are a terror, you are nothing anymore."
Like this: After betraying Jesus, Judas went and hanged himself.
(Matthew 27:5) And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.
Therefore, Jesus tells you to go and do the same.
(Luke 10:37b) Then said Jesus unto him, Go, and do thou likewise.
The context of Malachi 4:3 tells us that what is going on is happening on the earth during the tribulation, not after in the lake of fire...
(Revelation 20:4)* Then I saw thrones, and those who sat on them were given authority to judge. I also saw the souls of those who had been beheaded because of their testimony about Jesus and because of the word of God. They had not worshiped the beast or its image and had not received its mark on their foreheads or hands. They came back to life and ruled with the Messiah for a thousand years.
Do you see who it is that comes back to life to rule with Jesus the Messiah for a thousand years? It is not any of us in this age, unless the tribulation happens within our lifetime. It will be those who will be beheaded because of their testimony because they will not worship the beast or its image, and will not receive its mark in their foreheads or hands. Many bubbles would be burst if pre-tribulation and mid-tribulation believers would actually read carefully who actually has a part in the first resurrection...
Notice also that the rest of the dead do not live again until after the millennial reign of Jesus the Messiah. *Furthermore, if we take a look carefully at the great white throne judgment we will see that death and hades (hell in most translations)give up the dead that are in them. At this point, they (the dead) are then judged according to their deeds. Now watch carefully because it then says that any who were not found in the scroll of life would be cast into the lake of fire. Do you see it? If everyone who was ever in Jesus the Messiah is already resurrected before the millennial reign of Jesus, there would be no need to see if any of the dead were written in the scroll of life. This proves without a doubt that all that are dead (lost or believers) before the millennial reign are not conscious or alive before the great whit throne judgment, except those specified to reign with the Messiah during the millennial reign.
Now, a little more about your false perspective of those in the lake of fire being destroyed. I say false because in Revelation we are told that those who are not believers are still alive, but will not have access to New Jerusalem. Lets take a look at Revelation 21:27.
(Revelation 21:27) And in no way will anything that defiles, or observes idolatry or falsehood enter into it: but they who are written in the Lamb's scroll of life.
I find it interesting that there is a need to say that nothing that defiles, or observes idolatry or falsehood will enter into New Jerusalem if everyone who practiced such things were destroyed in the lake of fire. Furthermore, if we look closely at chapter 22 we will find that they were not destroyed (or burn in the lake of fire for eternity) because they are living outside of New Jerusalem.
(Revelation 22:15) For outside are dogs, sorcerers, whoremongers, murderers, idolaters, and all who loved and practiced falsehood.
Now I realize that this will raise the question: if they are outside of New Jerusalem, what happened to them in the lake of fire?
I have been said to believe in universal salvation, but that is not what I believe at all. I believe that everyone will be completely reconciled with God, but reconciled does not mean saved. Because of the length of this post already, I will explain what I believe briefly and will elaborate with scripture in a separate post if asked.
I believe that when Jesus the Messiah died on the cross, He became the savior of all men. Those who acknowledge Jesus as the Savior are saved, have their sins forgiven, and are adopted into the family of God. Those who do not acknowledge Jesus as the Savior remain lost, are not forgiven, and have no inheritance in Jesus the Messiah. Just because the lost do not acknowledge Jesus as Savior does not make Jesus any less their Savior. Just like those who do not acknowledge Trump as president in no way makes him any less their president. Furthermore, the work that Jesus did on the cross caused everyone that ever lived or will live to be justified to life. This means that, no matter whether or not you believe in Jesus the Messiah, death is not final. I also believe that all who die are dead until such time that they are called forth from the dead and hades (hell) for the Great White Throne Judgement (except those who will have their part in the first resurrection. see above). During that judgment, all will be purified and have their works tested by the Glory of God (lake of fire and sulfur; known in Greek culture as a lake of divine purification). All those who are written in the scroll of life will already have the life (Spirit) of Christ and will not be hurt by the Glory of God (lake of fire). Those who are not written are cast into the Gory of God (lake of fire) and lose their own lives and are purified by having it replaced with the life (Spirit) of Christ because all are justified to life. This process will be painful because the lake of fire (Glory of God) still has power over them. Those who were written in the Lamb's scroll of life are then free to live within and go in and out of New Jerusalem because their sins were forgiven and they possess the perfection of Jesus the Messiah. Those over whom the lake of fire had power, though they are justified to life, are still considered dogs, whoremongers, idolaters, etc. Because their sins were never forgiven and do not possess the perfection of Jesus the Messiah, they must always remain outside of New Jerusalem, forever separated from the direct presence of God who dwells within...