You can write something completely reasonable and still attract absolute dickheads - the internet is pretty special like that. I think a more realistic position is about how your commenting system motivates better comments, not to avoid criticism but to create a better product for your audience.

e.g., focus more on your commenting system than simply your content.

My local rag is a cesspool. No persistent identities, no karma, no community moderation, no other methods of promoting the best responses. You end up with drive-by insults and little of substance.