If I'd wanted to be Polish, I would have filled in the paperwork more than a decade ago.
I believe you Harry, but there is a catch, they would have to check your past for criminal records. Hence you prefer not to apply for the Polish passport.
You still wouldn't become Polish. Just a citizen of Poland.
Honestly I don't understand what you are arguing about? It obvious that there is modicum of culture shared by the people who are Polish, it is also clear that Soviet occupation produced some number of people for whom that shared modicum is an alien concept!
I call them soviet Poles.
However you are arguing with a foreign progressivism for them the very concept of nationality is a simple matter of the paperwork and passport. In their eyes if they have right papers and if they claim to be Polish they are as Polish as they come.
That is an ideological bias, you cannot argue with that. You would have a better change of converting a Muslim to Christianity than convince them to your/our point of view.