Everyone who's ever been through school knows this dynamic. Bully punches kid 90 times, kid punches back 1 time: Bullied kid is deemed "the problem."
In a similar way, Russian state-backed propaganda, allied with anti-Ukraine right-wing troll counterparts in the West, wants to exploit this one off-course missile to re-frame Ukraine as somehow being the aggressor in this whole conflict.
Poland itself doesn't think that, NATO doesn't think that, and anyone looking at this honestly doesn't think that. Russia started this war. All 91 missiles fired that day are a consequence of that.