I know what your saying and I agree BUT it's human nature.
We can't control what someone in a digital space does. We don't know them or even care what happens post-game. They may be teammates, but they are still strangers.
Also sometimes people just need to vent, release their personal frustration is game that allows time for players to auto walk to a location or type when dead or waiting. cause if they dont, they leave or afk or tilt, and that means no matter what they do, they will get reported or flamed back.
If you see someone like this, just type "Sorry bro, muted :("
let them type it out, you don't have to see it or read it. Play the game, win or lose, report when necessary.
it maybe easy for me and you, but it's not the same story for others. Lead by example.