All this boils again to emotions - people see french teacher having head cut off by student due to showing muhammad's picture in the class, and this trumps 1000s other data points and discussions. I am not saying such things should be ignored or swept under the carpet, but analyzed rationally, discussed and good measures taken, even very harsh if they are the best course of action. Simple folks don't want to hear arguments, they want to see blood and whole world to fix their lives so they can live like some tiktokers they follow en masse.
For Europe, yet again Switzerland is doing stuff 1000x better than rest of the continent. They have 3x the immigration of average western EU country, yet 0.1% problems with it. But its population is smarter and less emotionally driven, so populists have it much harder here. Also they as society setup the whole immigration as set of rules as expectations that everybody +-adheres to. But EU has too big egos to actually admit somebody is better and just learn from more successful, so they will keep fucking things up till people are so pissed they will vote for people who will do further long term damage but will tackle scary immigration boogeyman.
Now its really not a good time for democracies that don't have well educated smart self-sufficient population, dictators are coming better off.