It's like on Facebook - if something gets reported enough times on imgur it get's auto-censored until it maybe is manually restored by a imgur employee.

Because of that a lot of relatively benign Trump content gets censored on imgur because a lot of people find even his name to be offensive. Some even think his name is violence.

http://www.thedailybeast.com/articles/2016/03/24/emory-unive...

Not racial hatred, images of Robert Byrd kissing Hillary Clinton will get censored. Basically anything that is a joke at the expense of Hillary Clinton will get removed.

imgur CEO: https://i.imgur.com/D2j9SlH.jpg