This is another principle which is nice but can do damage.
You can want Islam to fit inside other cultures peacefully. That's an ideal. But unfortunately, in reality, adherents of Islam seem to cause major terrorist problems in nearly every culture with which they mix. Relatively-speaking, a large number of Moslems are drawn to terrorism, measured against Christianity, Buddhism, Hindu religions etc.
So this is a fact one needs to address rather than to ignore it. Setting aside the reason why, there's a question of what might solve the problem.
You might argue that you can solve a problem by doing nothing, as time will offer assistance. This idea might have seemed plausible with respect to fundamentalist Islam a decade ago. I thought this myself back then. But Islamist terrorism hasn't abated. Indeed, it has metastasized.
So we must try to do something.
In my view, the best bet is to engage Moslems in a way that forces a change in the violent interpretations of Islam - not by dismissing it but by refuting it - and in a manner that restructures Islam so as to remove the teachers of death-cult ideas from positions of authority. Clearly it is possible to be a Moslem and not to do nasty things. So finding a path towards this sort of solution is the only way.
Because we should not have to absorb more of this stuff.
The lesson of the Holocaust was not to ignore the folks who distribute horror. It was to break the ideas down before they get out of control.
This isn't about race in spite of the efforts of some liberals to pretend it is. It's about bad ideas promoted through a religion.