4V5s mean loss of LP anyway?

Why in the world should a team be forced to lose LP because someone either AFKs, has to leave, or just randomly' Dc's. It makes no sense why the participants have to suffer due to this, it not only makes the environment toxic, but can lead to others doing the exact same thing in later games due to the fact. Is there no way that the amount of LP lost can simply be lowered, and the amount of LP gained be lower? Would this simply not fix the problem, this way the winning team can still get the LP the feel they deserve no matter the circumstances, but the losing no longer has to feel the pressure of losing high amounts of LP for being down a player.