You seem a bit mis-informed about the system. Yes, players flag possible violations on the forums and in game. The only automated part that can happen is:
- Forums will grey out a post (but people can click it and read it) then send you an auto message telling you it is up for Moderator review.
- In-game enough spam reports in a short time can get you auto squelched pending GM review. That is primarily for gold sellers and such, but it can hit others if they upset enough of the community.
All actual post removals, thread locks, suspensions etc on forums are done by Forum Moderators at Blizzard, not posters. All actual Silences, Suspensions, and Bans in game are done by GMs/Hacks staff. Of course, people being human can make mistakes - which is why appeals exist to review the data logs attached to the penalty records.
Then you are well aware everything they do is done on Blizzard PCs, under their specific user account, logged, and reviewed. EVERY single thing. Misuse of the system or failure to follow policy would get them fired fast - which anyone who works there would tell you.