Russia is a rival

This is not a hot war, it's not really about kilotonnage, those missile interceptors are really just symbolic - literally nothing more than chesspieces - in a cold war diplomatic struggle of influence and reputation.

Russia is a rival - and the game goes like this.
Consider those familiar domestic situations where a woman provokes a man in a thousand invisible needle-stick ways and the man lashes out and goes to prison? Well that is what our duo Poland-America are doing with Russia - which, to its atsonishment, gets the blame among for provocatively wishing to start a cold war among those people who get their geopolitics from the headlines on the commuter train.

If Russia continues to take these provocations lying down - well, it's like the daily psychological humiliations in prison or a borstal that keep people in their place.
The idea is to torpedo Russians' growing self confidence. And if they do respond - they get blamed with starting the new cold war. They're in a terrible bind because the Russians either way they lose, and they lose what reputation they have for being nice guys - the soft power game for diplomatic influence in the rest of Europe.
Someone once said "Poland only wants its freedom so it can go about denying it to others." It's like someone has been in s straitjacket for 300 years and within five minutes of their release you understand what your forefathers' motivation was.
As I say: beware Poland.