Islam is not a monolith. Even Sunni Islam is bitterly divided against itself. Removing the meddling American presence in their lands, another Cold War relic, they are less likely to join forces against us than are the Catholics and Protestants in Northern Ireland.
Interesting that you conveniently ignored the rest of my post. But enjoy your isolationist mindset. When the conquering armies come pouring into our country because we chose to stick our head in the sand like the proverbial ostrich and let our friends die, instead of being engaged and helping to defend them, it won’t be pretty.