I say yes, but it’s a multifaceted issue and yes doesn’t necessarily mean having Muslim immigrants and communities is a bad thing.
I say yes because there would be far fewer domestic terrorism events if there were no Muslim communities, but I acknowledge the fact that many domestic terrorism acts were not committed by immigrant Muslims, but rather by young Americans who became Muslim and then became radicalized. Those terrorists weren’t Muslim immigrants and stopping Muslim immigration will not deter them because there is already an abundance of radicalized Muslims here that they can associate with, and even if there wasn’t they could still self-radicalize themselves via the internet.
The fact still remains that most of the people who committed terrorist acts in the US were inspired by people they met and associated with in American Muslim communities. Muslim communities do contain pro terrorist elements that seem to coexist with the majority Muslim population, to an extent that does not exist in any other ethnic minority population within the US. It’s hard to meet people with links to terrorism, who would like to recruit you, in a Christian Church, or a Buddhist or Jewish Temple but they apparently aren’t hard to find in American Muslim Mosques.
Even though we can say most domestic terrorists were not immigrants, we can’t say that our American Muslim community doesn’t seem to provide the type of support and guidance that was an essential component of what it took to radicalize and inspire them to the point where they are willing to commit terrorist acts.
Saying the presence of Muslim communities in the US is causing terrorism is comparable to saying guns cause gun violence; both statements ignore the fact that without a person who is inclined to perpetuate violence, the Muslim community and guns are powerless to do harm.