Um, random is random "intentional" or not. The point is is there screening of what comes out. There is screening in natural selection as well as the other processes I mentioned.
As long as there is some kind of screening to throw out the nonfunctional from the functional, random changes are fine. That's what evolution does.
That's what evolution has to prove, that selection can act as well as a program. However, as you've shown over and over, the majority of those random changes are not selectable.
And beyond that, even when a change is selectable, there is no program to stop changes that will damage the organism's population later.
We were watching Mythbusters earlier, and they really need to do one on evolution 'cause it is soooooo busted.