Why doesnt context apply or is it because it takes too much time?

Riot has the "if you get attacked you and the attacker get punished" mentality aka retorting to players but Ive always remembered when i got chat bans and see other peoples logs that they never showed context of what other people are saying but thats pretty bullshit imo. Its like telling a rape victim they have to go to jail for fighting off the rapist. Obviously not that extreme but the concept still applies and makes damn well good sense. People who stand up for others in the real world are praised and never face any consequences yet riot wants to be the holy trinity that is right? Pretty dumb that if players can be toxic towards you game after game by trying to help players you can still be punished for standing up for yourself. How is it being toxic to another player when they are the toxic one? Its like saying a sad person isnt a sad person or a mad person isnt a mad person just makes no sense.