@ErikJonker
I think it's a big stretch to claim actively entering the conflict to destroy weapons not targeting you is "purely defensive".
As for "not escalatory", fully written out this means "Putin will not think it is escalatory" (that the poles shoot down his weapon). The plausibility of claim is pretty obvious once you see its full meaning.
A responsible argument in favour would start by acknowledging that attacking russian missiles from Poland is an expansion of the conflict but then explain why Russia's response would be limited and the cost entirely bearable.
To pretend going to war is entirely safe is deeply dishonest.
@geopolitics