first, the US engaged in a war of aggression and probably not specifically a genocide in Iraq. This is a real difference of kind.

The other difference is that one actually happened and the other did not.

Also, if we were about to go to war with China, I bet it would suddenly become obvious to a lot of people that the US has been making shit up since the trade war started.

pretty obvious

iirc around 76% of Americans supported the Iraq war.