I disagree, you don't need a "rock-solid strategy for moderating" "user-supplied content", you just need a user base that is by and large not inciting violence, particularly against government officials.

If I run some hobbyist forum where say 1 in 1000 users is posting hate speech or calling for violence, as long as I have less-than-rock-solid moderation that can clean up some of their posts and ban the worst offenders based on user reports, I wouldn't be too worried. It's also in my interest to keep the community healthy.

Now, if 20% or 50% of my users are posting hate speech and calling for violence, yeah I would be worried, but I would be less worried about moderation, and more worried about why my hobby attracts extremists. Might call for some self reflection.