I never said Trump was or wasnt racist... Having an article talking about racist claims against him is not the same as saying he is racist.
As for why Biden lacks a article about his racism.. well generally far fewer notable accusations of racism have been made against him to fill a page. That said, if you feel there are enough notable cases of him being called out on racism then go create the page for it.
Now if you can show people have tried to create biden-racism pages before with well cited reliable sources and the community shot it down, then yo might have a case as well.
Yea there are some racist crap from biden... so go add it to an article. If you cite it it will likely stay.
I have done a lot of wikipedia editing in the past, I am familiar.
Yes there can be edit wars. But for something like that, presuming you cite it well, it will likely be accepted without conflict.
I've edited all manners of pages before. Again not claiming there wont be edit wars (and ultimately things going to vote). But something like that isnt likely to be rejected.