Re language, I'm also an English teacher, and I don't find the proposition that you can teach yourself a language to near native speaker level incredible. If you want to start a general discussion of that topic in another thread, please do.
Re legal issues, if someone is crying wolf, that's obviously a needless distraction, like many other things online and offline. If we receive a complaint that a post is defamatory, we will of course look into it and remove it if that seems the most prudent thing to do. But if the person accused of being a wolf has never existed, and the claim doesn't involve a threat to public safety and so on, it's difficult to see how anyone stands to get in trouble, legally speaking.
If you can prove someone is a troll, maybe you can sue (in one country or another) for your precious time having been wasted. Great, make it a class action suit. Trolls will tremble in fear! The interwebs will never be the same!
Until then, we will continue with our current system and wish you a pleasant day.