Polish law requires all animals to be stunned before being killed. Halal and kosher require the animal to be conscious during the slaughter.
So? The animal goes through the slaughter house with the smell of death and blood in its nostrils, and then gets hung upside down and slaughtered...even if there is a small stun just before the act.
This type of thing is true whether it is beef, chicken, pigs, etc. they all have to be slaughtered before they are eaten and someone does that work.
Canceling Kosher slaughter is nothing but a purely political symbolic gesture aimed at satisfying a very small group of people in a special interest group. My guess is the Jews treat those sacrificial animals, in whole, much better than they are treated in a slaughter house.
In the end, people in Poland eat meat, so animals by the millions continue to be slaughtered. It’s a part of life.