Not to be rude, or indifferent to your plight, but it sounds like leaverbuster is working as intended. It affects other people's games when you can't connect to the game (whether your own fault or not). If you consistently have trouble connecting to the servers, or the servers have trouble connecting to you, then action is taken that you don't ruin other's games.
No one is saying "you're a bad person." It's just saying that you and Riot's servers have a rocky relationship and this might get in the way of your interaction with others.
Riot's servers went down as I was joining a game and I couldn't play for two days and I had to reinstall the game since their crash corrupted the files.
None of that had anything to do with me, my internet, or my computer. But I got the "I Agree" Leaverbuster warning. That's just how it works.
Sorry about your rerolls, though.