I told my uncle in law that he needed to leave Thanksgiving dinner because he wouldn't stop attacking people politically.
Was it really necessary to ask him to leave?
I believe so. I care about my family and I think my uncle's an idiot.
We can be frustrating when a family member brings up politics Thanksgiving dinner, but ostracizing them isn't a good solution. If you ostracize a family member, then they may become more isolated and radicalized. Try your best to keep the peace and see your family member's perspective, even if you don't necessarily agree with it.
They were too aggravating to ignore.
Even so, keeping the peace is good for the family. Try harder next time to do that.