Use your own brain.
There are plenty of those who run our government (officially or unofficially) who want most of us dead, just because we challenge their authority.
What would make Ukraine different?
When was the last time we had a government sponsored mass murder of civilians in this country? And that does not even touch on the question of motive. The “false flag” suggestion implies that the only reason they did it was to make Russia look bad. That is wholly implausible. Nothing like that has ever happened in the US. I am not sure it has ever happened anywhere. If you want to win a war, you don’t murder your own people. Hitler proved that. And even Hitler did not murder them so he could blame us.