The US is a liberal race blind society with freedom of religion, it prides itself on being a melting pot for all lovers of freedom (freedom of religious and political association among other things). With race and ideology blindness you get this, or don't you? If some politician said he wanted to close the borders to all but Christian Whites he'd get nowhere in politics and the Jews would cancel him immediately. So how do you guys propose to fight this population replacement? Would you support an openly pro-White racist politician who fought the open borders Internationalists H1B shithole shitskin country advocates and big corporations? It's pretty hard to screen and divide Muslims into good and bad ones I think.
Regarding homegrown Islamists, it's a known phenomenon here in Europe that the 2nd generation immigrants are worse that the actual immigrants.
The US is a great place where even an Islamist terrorist can be rehabilitated and given a chance