What the heck is a mainstream muslim?
A "Mainstream Muslim" is one that engages in the most egregious and destructive conduct but whi will always find a willing defender in a Leftist, who considers such conduct merely an "expression of Muslim cultural norms".
"What the heck is a mainstream muslim?"
They are the ones who quietly approve of terrorist actions. You know, the ones worry more about reprisals from terrorist attacks than the the attacks themselves.