What’s wrong with the countries the Moslems are leaving?
They're filled with other maniacal murdering moslems.
The mission of Islam is to spread Islam over the entire planet.
To do this you have to go to every country and bring it to Islam even if it takes centuries,
If Muslims can't forcefully convert or kill you they will out-breed you.
If they invade in mass it is a Hegira, like Muhammad did when he moved his companions 200 miles north to Medina from Mecca.
The Muslims took over Medina, and later when stronger and militarily organized returned to conquer Mecca; and the rest is History.
Islam is not designed for a particular group of people, or a region ,it is designed for world domination, no matter how long it takes to achieve that goal. -Tom