What the hell is protecting people from being trolled by someone already in their game?

I get it, we have the report system to punish people AFTER. But why is there nothing to help us DURING the game? What's stopping a player from running it down mid or afking because they didn't get their red/blue? Great, this person MIGHT get banned after, but the other 4 ppl just had a shitty time and were literally held hostage for 30 minutes. And then you lose LP if it was ranked. Can we get a vote kick system or something? Replace them with another player? Work out a system that will function in ranked? It's stupid. I can report a guy all I want, but the damage was already done and I couldn't do anything to help myself while it was happening.
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