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There is an automatic system to detect leavers, it even puts their name in red in post game.
Why should I still lose 21 LP when I played the whole game down a man?
I don't cry when trolls lose me LP because detecting trolls is difficult in a quick LP gain/loss at end of game. But leavers is pretty much a guaranteed loss in Bronze tiers solo queue (I think Ive won once or twice).
I'm not saying I shouldn't lose anything, it is still a loss, but the system should take it into account and even just cut it by 20% or one fifth of the team.