Interesting points, but I doubt this is grounds for banning someone from a site like Saidit. However, to say this:

"pedophilia is pedophilia, and should always be punished with death"

And to spread disinformation and misinformation is spreading hatred on Saidit, and perhaps there should be a 'flair', 'tag' or similar that notes some of these posts are potentially inciting violence. The tag could be 'Inciting Violence?' or similar. After getting a number of these tags, the user could be warned, or worse.