What "helped pave the way for the horrors of the Holocaust" was the fact that 3.3 million Jews were living in pre-war Poland and so the Hitlerites did not have a huge logistical problem in rounding them up and annihilating them once the Polish army had been defeated and the nation crushed. Of course there were anti-Semites and collaborators in Poland, and the pre-war Sanacja regime should have been far more robust in their attitude to the extremists, but the inaction of other European countries, which allowed the Third Reich to re-arm while doing nothing, is what fundamentally allowed the subsequent horrors to happen. 

Having made the above point, I agree with the rest of your observations and I feel that the sooner the xenophobic Kaczynski steps down, the better.