Sick and tired of Rage Quiters

I was in a good mood for a game but that game ended up giving me a very rage inducing game. I was playing as Cho gath Jungle. But Mid Leblanc starting to feed mid Zed, so naturally I start camping mid yet Leblanc still died. End up Leblanc rage quits the game and never came back. I feel like players like this should get heavier penalized than having leaverbuster.