Unreliable rules enforcement

The way it works is this:

Most of the penalties are automated, AFAIK, and support tickets usually don't accomplish anything even if merited (although, to be fair, people who successfully appeal something are less likely to post about it, so it could just be that I only see the negative results).

The issue with this is the following:

If a player spends the first 10 or so minutes trolling or griefing, and then starts legitimately trying to cooperate with the team and win, that player virtually never gets reported by anyone other than the immediate victim (eg the person runs to lane, shoves the waves to steal xp, feeds the laner, and puts the other mid at level 6 while you're at 3. Yes, this is specific for a reason).

That is, this player gets away with both ruining the enjoyment and ruining the chances of winning the game, with no penalty. The problem with this result is that it enforces a rather unfortunate dichotomy. You can then do one of two things:

1. Ignore it and play on. Mostly better, but then the player gets off with no penalty for ruining the game. Plus you're almost certainly going to lose anyway, so sportsmanship doesn't affect the outcome of the game.
2. Vigilante-esque self-enforcement of the rules by flaming the person. Not a good option, but it happens. The main issue is that the other player still has no penalty.

For the love of god, riot, please at least have human review on these things. I'm usually pretty calm and supportive - I know mistakes happen; they're annoying, but I make them too, and I don't hold them against people. However, active griefing in a single game rarely carries a penalty, so I flamed people twice for the exact behavior described above and now I'm chat restricted and they got literally nothing.

I'm not arguing against the chat restriction; yes, I broke the rules. But so did they, and it's incredibly frustrating that the only recourse available to me is to be toxic, when they never get punished. Reviewing cases is used to determine if the penalty was merited, but has no option to see if someone else also deserved punishment. Please add a way to do this. I don't like flaming; it's not fun, but neither is the fact that your report system actively enforces doing nothing when someone goes from trolling to pretending to try.