Why does RIOT have a "GUILTY until proven INNOCENT" motto to anything player related?

I recently got disconnected just when my ARAM game started and was not able to get back in after because my internet at home was acting up. When i signed back in the next day, I was "FORCED" to write(type) "I Agree" about never ever leaving a game or AFK'ing in the future. My worry is about how RIOT goes with its dealings, it considers every single reported person (I am assuming my team reported me for AFK, can't blame them) as guilty without trying to figure out if they were actually doing the same. For toxicity and other negative behaviors, one can easily look at the chat and see other means of such profane acts being committed but for things like AFK how can it always assume that the concerned person wanted to leave the game(early) as opposed to being thrown out of the game due to network related issues. I am a computer engineer and i can personally think of some many potential points of network failure that can happen between the time the game loads till the opening game screen shows up with the home nexus and all the champs which could lead to people getting "Disconnected" and not being able to join back in again in to the game.

My only request to RIOT is to consider a better way with dealing with the AFK's and not put it in the same light as other potential offences. If you have a leave buster bot trying to figure out if the person intentionally quit, that piece of algorithm would always consider all leavers of the game as offenders and unnecessarily hurt good patrons of the game who didn't have any malicious intent and want to just have some fun.

Thanks.