I'm in no way denying that this time around things seem to be more homogenous in where they are coming from.  There are outliers like the guy in Norway, or the church shooter in Atlanta, or even the workplace shooter today, but yes, the majority are Muslim.  

Here's the thing, though, we invade their countries, arm the despots running other of their countries, and bomb their populations.  They don't have sophisticated militaries, so they fight back with what they can.  We have brought this on ourselves, and just continuing as we have been isn't going to fix it.  We really need to just pull the hell out of the middle east entirely.  Let them fight each other, and without us as an enemy, they will.  The panic coming from many, mostly on the right in this country plays right into what they want.  They want us to lash out, it gets them more converts to their twisted ideology.