How would returning lost LP or raising MMR after being trolled break the system?

I was having a conversation about having lp restored or mmr raised after being in a game with someone who made team lose on purpose and the RS said doing so would break the system. How would it break the system? {{sticker:sg-lux-2}} Please don't give answers that use "can't tell if its trolling" as a basis of argument, this is for Clear Cut scenarios like if they rush shoes use up ghost and flash at the beginning and start running down 28 deaths from base to turret spamming laugh for the rest of the game.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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