The cosmopolitan worldview that approves of melting-pots was born in response to the terrible failure of nationalism, which "we" experienced to the fullest.
History hasn't ended up yet. I think we're going to see how far the string can be tensed, and whether that multi-culti "solution" isn't the genesis of new strife. Things aren't looking bright.
If you think freedom of movement is bad, do you think capital should also be controlled?
Actually yes, in moderation. I used to lean libertarian, but not anymore. But that's another talk.
then the same should be allowed for people, surely?
Why? Capital at least doesn't behead you, people do.