Dr Peter Hammond has done a study on this. The tipping point seems to be when the host county is around 5% Muslim. Then the Muslims get very aggressive in their demands.
Germany is now around 7% Muslim.
Hammond’s full study is here:
https://virtueonline.org/what-islam-isnt-dr-peter-hammond
God tells us in Genesis 16:12 that the descendants of Ishmael would be violent. That’s just their nature.
Genesis 16:12: “He will be a wild donkey of a man; his hand will be against everyone and everyone’s hand against him, and he will live in hostility toward all his brothers.”