Wikipedia does have many problems.
This one made me think a bit.
https://www.wired.com/story/one-womans-mission-to-rewrite-nazi-history-wikipedia/
I do know, in theory, that Wikipedia is not accurate, but this is outright dangerous. I definitely would have believed it.
By its very structure, Wikipedia is always going to be susceptible to attacks. I have seen amateurish attempts which can hopefully be recognised easily, but these are difficult.
Just a very bad place to be in.