Every immigration ends with conquest, proven by history. That's the reason why some people are concerned about Muslims.
Now let's start.
#1. Slavic & Germanic migration caused by fleeing from Huns,
they fled from war, didn't they?#2 European migration to South America, they came there to see the land, ended up genociding Mayas and Incas.
#3 European migration to North America
#4 Ancient Egypt fell few times, one of the falls was caused by immigration, also they were minority in their own country because of Libyans
#5 Vikings to British islands
#6 Huns
#7 Mongols
and many more which I don't know
Every movement of the people is some kind of unnatural and as you see it ends up with conquest.
And how are they endangering your people or your right to live? By trying to escape war zones and slaughter at their own homes? Majority of them just want to have a normal life.
There's no war in Qatar and U.A.E, yet no one goes there and both countries are pretty rich.