A US president does not have authority to start a war, Congress has, according to Constitution. The president only serves as a Commander in Chief.
So at any point Congress can stop any military action issuing an immediate ruling preventing the president doing anything. If our congressmen don't do that it means they approve it.
It's our, USA, war, not Trump's war. Because we elected the congressmen.
These needs to be repeated everywhere until people understand it. Same situation with tariffs.
This stopped being alternate realities a while ago, as it became a collective project to form anti-realities.
— Stephen Colbert, 2006
https://www.c-span.org/clip/white-house-event/user-clip-step...
Who else should have "owned" it?
Many massacres and genocides are "owner-less" and obscured by history. To give a few exemple, you might find, but the trail of tears is not as front-and-center in US' history teaching as the holocaust is in German history teaching.
You'll find similar situations for all colonial powers who didn't get dismantled and forced to accept their wrongs after losing a war. You may even go as far as to say that Germany is the outlier here.