Your example with the python list comprehension could just be an example of a conflict over content because of an inevitable difference of opinion. There is nothing wrong with that, and no way around it: you either invest enough of your time to work it through, or pay someone else to do that (although I don't know how you could find someone both competent enough and willing to do it).

The example with the antisemite is probably more complicated, if you wanted a discussion on it you should have posted a link to the relevant discussion on Wikipedia, but I very much doubt it would be appropriate to take Twitter as source in that case, because Wikipedia is not meant to be (an extension of) social media. Also, it seems like you are not aware that it is very much possible to be a pro-Israel antisemite, e.g., the Nazis at one point supported Jewish Zionist emmigration to Palestine.

BTW, I am not a Wikipedia apologist, see my next comment.

It is true that low quality journalism limits Wikipedia in certain areas, but also note that good Wikipedia sources are not limited to newspapers, see: https://en.wikipedia.org/wiki/Wikipedia:Verifiability#Reliab...