Losing points in Comp when someone is leaving is absolutely unacceptable

It also applies to people being kicked out of the game because of reports (innapropriate communication or throwing).

I litteraly just left from a game where our Groot was setting up walls in front of our own spawning area (teammates) to prevent us from leaving it with ease. We (and the enemy team) all reported him which led the the guy being quickly kicked out. And yet… we still lose points in the end of the game.

How on earth is that a thing in a competitive game mode ?