The issue with a response of more anti-air systems then is that it would increase the risk of more missiles ending up in adjacent countries (Ukraine can't be expected to stop defending itself over the risk of it resulting in this situation) so the focus has to be on the fact that it wouldn't be a risk in the first place if Russia wasn't firing hundreds of missiles at Ukrainian cities.That makes more sense than the idea that Russia targeted a strategically important grain silo in Poland.
So the Russian narrative will be it was Ukraine but the reality is if Russia wasn’t targeting civilian infrastructure hundreds of miles from the front lines, this would not have happened.
Fact is that Russia's jingoist aggression has regardless of intention claimed the lives of two Poles going about their business in Rural Poland and that can't simply be ignored.