Riot does protect feeders.
They also don't put them in the elo they belong, so those that do not feed, are matched with those that don't understand the most basic points of the game. Further if you play well, you are more likely to be matched with bad players.
Welcome to league, seriously go play another game. I started to play something else and realized just how frustrated I've been feeling playing league. League is fucking terrible, just move on.
I may try again here or there, don't get me wrong, I love the game. But game quality is absolute shit, because of the exact question you've asked.
Chermorg is right. Except that they aren't tilted, they just aren't in the elo they belong in. No is willing to admit that matchmaking blows ass and has you teamed up with players you should not be. Its just a ton of excuses.
Its clear as day, but whatever, fuck league if they are going to say its fine. Its not. Its obvious. It can die then, its no fun anyways. They're new player base isn't going to exist and the game will fail.
The only hope they have to artificially bring new players into the game through college programs. Thats how they will keep the system going, they won't give a shit about solo q because its not needed any longer to achieve the main goals.
Don't know what to tell you. Its not going to be the common mans game. Unless you're insanely good, don't expect to have fun. Fun has left league. Left a while ago. They won't even admit to the issue, so of course they aren't going to fix it.