That's the problem. It's not clear. There's a lot of unanswered questions there: how does off-site activity on Tumblr and other sites get linked back to specific people and the overall thrust of a subreddit? How do you even solve that problem in general?
I have personally observed chan (not 4chan) threads involving skimming certain subreddits and finding targets to harass without even having Reddit accounts. We've long observed 4chan/goon "Redditors" in YouTube comment threads. I'm with you on releasing how they got there, and I think it would provide a lot of clarity.
One last thing, I have to correct you: I never said Reddit was squashing free speech. I wish they'd pick a consistent value on it, that's all, and I pointed out specific things said in the press about free speech. I'm less concerned about FPH than I am about something like /r/jailbait, which got removed because it became the squeaky wheel due to CNN attention. There are worse subreddits regarding sexualization of children, and Reddit fails to uphold its own standard there, which negates the standard itself. That's my problem.