These narratives have real world consequences. Anytime you mention Xinjiang or that China is committing a "genocide" to liberals and conservatives it helps spread this shit. It helps reinforce Sinophobic narratives and will result in more deaths. Combat these lies and this propaganda where you see It. It is our moral duty to do so.
I would say we've never gone to war over genocide. I think we pretty much entered WW2 because we we're dragged into it. If Japan wasn't threatening US colonies (Philippines) which prompted the oil embargo and which then caused pearl harbor, I don't think we would have ever been involved.