Pretending that a system is morally neutral when it treats truth and lies as equivalent value? "This person likes lies, I'm going to give them more lies" is a terrible system that ends up with the computer teaching the blood libel to children and raising them as cheerful genocidists.

Note: I'm not saying this is the same as the left/right axis, just that a lot of the horrendously dangerous material is dangerous lies being presented as fact.

(A personal example I was confronted with was watching a game-related video, where the entire sidebar was videos relating to the same game .. plus a livestream of Tommy Robinson. Why was that there? Does that imply there's a crossover between games videos and far-right videos? The system is too opaque to even tell me why it wrongly thought I would like it.)