How strange that Washington was so quick to absolve Russia of responsibility for Polish rocket attack

How strange that Biden, NATO, the Polish government and the mainstream media, all of which are hostile to Russia and demonize Putin, rushed to clarify that the recent missile strike on Poland was not launched from Russia and was most likely unintentionally fired by Ukraine, and that in any case it was not an intentional act of aggression. Or is it that strange? Official Washington discourse harps on the fact that there is no danger of a military confrontation over Ukraine, lest people in the U.S. start getting worried and begin to oppose the proxy war that is taking place. The last thing Washington wants is the emergence of an anti-war movement of the likes of the anti-Vietnam movement of the 1960s.