Although multi-culturalism clearly hasn't worked as planned, the fact is that civilized ADULT humans are often forced to make the best out of a less than favorable situation
So even though this philosophy has not worked anywhere at anytime people are just supposed to go along with it?
How should people let governments know that their actions are unacceptable (don't say elections - they are useless when all the major parties agree on a particular issue).
Always put oneself in the uncomfortable position of the minority aka migrant foreigner
Why? What good will that do (besides facilitating their predations against the indigenous populations)?
They're usually just an unwitting pawn in international money games
The plain fact is that Europeans have built a pretty nice continent to live in. Now, more people want to live in it than can be let in without ruining everything that makes Europe a nice place to live.
The tragedy is that many of those who want in are carrying cultural habits and values that cannot build a nice place to live. And the failed policy of multi-culturalism insists that they keep those dysfunctional values instead of adopting European ones.
They have made it very, very clear that nothing less than force will stop them in greater and greater numbers. If European govenments won't apply that force then it's going to be the indigenous populations that do.
I'm not advocating violence against migrants, just pointing out that it is the natural consequence of the current dysfunctional dynamic created by moralising idiots like Merkel and Juncker. Anyone who can't see that is either stupid or playing stupid.