What if statistics would say that inmigrants do more crime?

Then we’d likely see a reversed set of incentives - lower expenses, fewer personal risks, less surveillance, and a screening process that encourages a surplus youth male population.

Each person should be judged by it’s actions

That’s expensive and inefficient. Far cheaper to apply a regional/ethnic heuristic, even if it is less reliable per capita. Build a big beautiful wall to keep all the Bad Guys Out, because you know they’re statistically bad, rather than staffing the border with Personality Inspectors and Minority Report style future-crime prediction police.

Also, I refuse to be called “worse” just because I did not emigrated, just saying.

You’re statistically worse for staying in your shithole country, rather than coming to the Best Country On Earth.