Here are the ways that a channel owner may eliminate trolls on their own:
1. Disable comments entirely so that you need not monitor them at all. (That's what I did, since I just cannot look in as often as I'd like.)
2. Set comments for prior approval, in which case you need to visit your channel religiously to keep up with things, mostly so that the nice people who said how good your clip was can be allowed to speak up as theirs will be held up by this process too. Or:
3. Visit your own channel often and delete the crap after the fact. Yes, you CAN do that -- troll words are not written in stone! They are only data! ZAP!
You can also execute further punishment. Find the "block user" option. Now they can't do it again even when you are not watching.
Trolls get by with it because channel owners are either too lazy to do this or, more likely, they think they are helpless to stop it. They do not know that these controls exist.
So here I am to help stop YouTube trolls...by educating channel owners.
Read the help files. And really look at all the options on your channel. Some of it is right there in front of you if you are only observant or spend time digging around a bit.
However, this video is posted from Russia! There's a good chance that the owner of this channel can't even read these comments.
Which begs the question of just how fulfilling trolling really is in this case.
I will never understand the troll brain.
Nessie