It comes down to whether Islamic values and Western values can coexist. The weight of history seems to declare that they cannot. To paraphrase what someone once said about the Constitution, Western liberalism tolerates dissent and different ways of thinking, but it is not a suicide pact. For example, women have something approximating political equality in the West, but this is alien to most Muslim countries (don’t say “But I favor women’s rights!” - that’s just you.) . There really is no room for compromise on the matter, so if Muslims want to immigrate and not cause violent dissension, they are going to have to modify their views on women. The question is - will they?
Anyone who posts to the SDMB for any length of time is pretty much guaranteed to have bought into Western values - free inquiry, tolerance for dissent, all that. I won’t presume to know your cultural milieu, but voluntary immersion in Western society for an extended period of time will tend to make a person adapt. But large-scale immigration creates enclaves within which there is little pressure to adopt new values, and in fact, may encourage immigrants to cling more tightly to their existing values.
I’m not suggesting reviling or berating Muslims as a group, only that large-scale immigration makes violent conflict more likely. You can interpret that as saying that a million Muslims in Teheran do not concern me, but a million Muslims in Detroit would.