I don't know how much you know about the Washington Redskins naming controversy. There's little doubt that "redskin" is a slur today - Native Americans say so, and it's kind of up to them. The status in the 17th and 18th century is a bit less clear IMHO.
Wikipedia says (or said, I guess - I haven't checked) that it unambiguously *was* a slur then too. As evidence, it cites a study of 17th century literature that notes redskins were more likely to be villains than heros in a small sample of 80 books and a diary entry about a sign outside a small town that said "Indian / Redskin scalps - $1" or some such. I don't recall the details.
The point is there wasn't one cited source that showed redskin specifically was a slur, only general evidence that white settlers were racist against Native Americans. Clear WP:SYNTH violation.
Tried to make my own changes, got immediately reverted. Tried to start on the talk page, got totally filibustered by two editors who has the page and a hundred other racism adjacent pages on their watchlist and whose edit history was basically just those handful of pages. Started reading about internal wikipedia boards I could appeal to. Stopped and logged off.
Once you start noticing things like that and start double checking, you find such minor distortions in a lot of political adjacent Wikipedia pages.
Another good example is to grab five super murderous left wing dictators and five super murderous right wing dictators and read the summary section. Use a pen or a highlighter and classify each sentence as positive, negative, or neutral.