Any aggression towards Poland is a very different level and degree than against Ukraine, Georgia, Chechnya, etc.

Do you really believe the EU and NATO would sit on their hands in case some low level pro-Russia insurgency popped up in Byalystok or Lublin? Not only that, do you believe the Polish government would be doing nothing and accepting pro-Russian separatism cropping up anywhere in its territory?

I don't think there's anything the Poles hate more than Russian imperialism, not even sure if they hate Hitler more than that to be honest...

Rather than alluding to some imagined well-spring of "hate" within the Polish character or soul, another take on the Polish attitude, which I personally favor, goes like this:

They're done with being invaded, occupied, pushed around and/or talked down to by all of their various neighbors and competing empires over the past many centuries.

Meanwhile, most of them (even by far their worst occupier in recent memory -- the Germans) seem to have learned a thing or two, and have moved on to other (more subtle, and in any case non-violent/coercive ) forms of one-up-manship in the great game of national assertiveness of competition.

Except for one of course. And that's the one they rationally devote their concerns in regard to, in the present moment.