I imagine they don't want to end up where the US is now.

Edit: is reality too upsetting for folks? Hopefully nobody was asleep when American candidates ran on immigration policy, their constituents voted based on that, and we ended up with the current politicians and the overall status quo? Or do people not see a causal chain here?

You mean the wealthiest country in the world with a thriving, educated, well-integrated Muslim population that earns well above the national average income?