TL;DR: In a plot to destabilize the EU, Putin and Lukashenko personally and directly caused masses of people to migrate from the Middle East, Asia, and Africa, so Poland won't observe the legal right of asylum anymore. They also decriminalised shooting migrants "in self defence".
(Edit) This is from the new, supposedly less fascist Polish govt lol
The thing is that those migrants are not the cause, but rather the inconsistencies inherent to capitalism. But we cannot say that out loud because the 1% owns our means of production, the media, etc. And the migrants are easy targets. It's literally a perfect visual example of us vs them (white people vs non-white people) and many people fall for it sadly.