What more can Riot do about toxicity, namely in Ranked.

We've all had it happen, and here I am posting because a flagrant instance just happened to me. There was a duo dead set on throwing the lead we had gotten early on, a substantial one at that. They succeeded, and frankly my first instinct is to just uninstall. With members of the community dead set on throwing games, why take competitive seriously when all it takes is one individual to give you the metaphorical middle finger and throw. There is nothing you can do except report, and even that feels entirely unsatisfying because they can just as easily use another account. Couple this with the fact that even a permaban won't bring back your LP, and you get a situation where you feel as if the time you took to report was meaningless. What can be done to mitigate the large negative impact toxic players have on the overall community? Punishment is only one half of the equation, and there is nothing being done to compensate players negatively affected by feeders.