Why is leaverbuster punishing legitimate disconnects?

So I started getting massive lag spikes three minutes into the game. after restarting the client I decided I needed to restart my router. It took me approx 7 minutes to get back into the game and from that point I was fine and played up until the game ended at 25 min. What I dont understand is why leaver punishes players who manage to get back into the game and make a contribution. Surely it should be able to differentiate between rage quiters who then might log into a game and just sit in the fountain as opposed to those who are gaining levels and contributing in fights?
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