Then let them stay in their Muslim countries and leave us alone.
They are already here. The French terrorists are French citizens. For SOME reason we don't stay out of predominantly Islamic countries.
When a particular race, ethnicity or religion is marginalized there will always be blowback. "Live and let live"; "the golden rule"; there are many terms for a simple principle we all should have learned in elementary school and Sunday school that as adults many of us forget. If we are treating others like we want to be treated, then we really must want to be hit, and hit hard.