I find it rather sad that many in the mainstream media believe that trolling will be eliminated if Anonymity is not possible. It's not only a belief based in ignorance, but also a reflection of a bias that leads them to believe that their personal and professional experience is universal.
It's partly a reflection of the culture of comments on mainstream media sites. The vast majority of which have a horrific comment culture in which trolls haunt their sites and terrorize journalists and users alike.
Explicitly this has come up over #IdleNoMore coverage as the racists and xenophobes have been out in force to denounce attempts by Canadians to stand up for treaty rights and the environment.
Health Mallick writing in the Star seems to argue that the only reason the racist comments are there is because the posters are able to hide their identity. She asserts this as a reason why real names should be a requirement for posting online. (While I agree with her the racist comments are deplorable, I don't agree they would stop if the racists had to post under their own name).
Google and Facebook feel this way as well. Though I suspect their reason is less one of online civility and instead part of their business plan and pursuit of profit. They want real names so they can connect your interests, friends, and online activity.