> I feel like a large part of why people on the internet are so terrible to one another is that there's really no accountability because of the anonymity.

Sounds plausible until you consider that many of the worst comments are written by real people logged in using their real Facebook accounts -

... and some of the best forums online don't demand anything but a username and password like here.

IMO real name policies are way less effective than some people want you to think, and they'll effectively prevent certain minorities from participating in online debates.