Like another person posted, its not blizzards job to teach you good manners, its something your parents/guardians should do and generally something you should learn on your own, people who get angry and toxic/abusive over a game shouldn't really be playing games until they sort their attitude/anger issues out.

As for the "not doing anything wrong without solid proof that they were abusive/toxic" if they tell themselves a lie enough times they'll believe it and they know fully well that they're being abusive/toxic and an asshole in general they just don't want to take it as a hard fact that they have anger/toxicity issues that need to be dealt with.

Yeah the OP admitting they were toxic is the first step to learning, the next step is to realise its a game and there isn't any real point in getting angry over a free to play game, I've also never been silenced and only banned once in WoW (quit pre pandaria) and I know exactly what I said to get banned and learnt from it and as a result have never been banned or silenced since that incident.