They like to talk about in their history about how supposedly the Polish pans ruled over them and mistreated the Rusyni (forgetting conveniently that there were many Polish peasants as well).
A Polish intervention in Ukraine would stir up too much of this anti-Polish antagonism (remember the massacres of Poles by the UPA?)
Oh yes, I know all about the UPA, and there are still many Poles that frankly prefer Putin over the “Banderowcy”. It distresses me to see them weighing so much influence there, and it’s not all just Russian propaganda, they may be exaggerating a bit their influence, but it is there, and it is disconcerting.
I’m not suggesting Poland take back Lwow, or anything of that sort, but certainly to assist Ukraine and protect Poland’s borders, and let Putin know they won’t get all of Ukraine cheaply. I would believe a good number of Ukrainians want to be a fellow EU member with Poland.