“Leave the country and let them kill each other.”
They also tend to try and kill us. When left to their own devices.
That’s why we need to keep them out and be very vigilant about our borders.
We cannot colonize all Muslim countries.
For one thing they outnumber us by a huge amount.
Muslims are almost 25% of the word’s population.
We are 5%.
Do we really want to spend all of our resources over there babysitting them and trying to keep them from killing each other?