Riot should make bigger punishments for leaving

Like seriously. Had 2 games in a row in ranked where our Renekton inted 0/17 then left and other game where Riven just left without saying a word why she left. Fun is that they get the same LP loss as all other 4 players who tried their best to 4v5. I think these 4 players should get lesser LP losses and the player who left should get major like 50 LP loss.