Lose less LP w/ troll/toxic teams

I recently played a game of ranked with my friend and we had 2 team members who just decided to flame each other as hard as they could. Obviously, this leads to us losing the game even though I thought the game was winnable. We lost LP for losing the game as we should, and after the game ended we reported them both and got the two banned (got the instant feedback report). I thought that maybe if someone gets banned in your team, the other members of the team should not lose as much lp as intended because the loss was not because of them.