I am not aware of any current accounts that are bots, any bots are deleted upon discovery. I do have to prune 4-7 new accounts per week that are obvious bots but any others that are suspicious I limit thier trust level until proven otherwise.
Per your previous experience with some users like HIROSHIMA, they wore out thier welcome by constantly antagonizing users and have been suspended. There is a fine line between respectful and productive discourse and simple being a reply-guy with too much time on your hands.
If you see or suspect any bots please flag them, I have a number of admin tools at my disposal to see if a user is “real” or not.
Since returning to moderation I have posted my thoughts with regards to moderation here and Moderation feedback - #118 by Shawn.
Feel free to reply and provide feedback in those threads or DM me if issues arise.