It isn't all right wing stuff. The recent banwave took out probably the largest leftist community on the internet after a long period of banning users who upvoted opinions there, such as:

* Slaveowners deserved to die

* John Brown is an American hero

* Police & large-corporate property constitue legitimate political targets during protests

etc.

Essentially reddit wants to restrict the scope of permissible discourse to the same region allowed on mainstream news websites: support of neoliberal capitalism with debate focused on how overtly racist the system should be.