Why is great success in ranked met with such a cheap way of preventing further climbing?

7-3 in promos. Coming out of promos, I got Silver 2 in a day from S3, played a while, made it to 96 LP at S2. At this point I was about 22-10 in ranked W/Ls. I was playing extremely well, carrying the majority of my games, and, above all, had good teammates. Then I lost one. Then another. Now I'm 29-28 in W/Ls. I was still playing well after losing, but I've slowly been going on tilt because ever since then, I've had an afker one of 3 games, someone flaming everyone every second game, and someone feeding to ridiculous levels (think 2-12 by 30 mins or something) almost every game.

For anyone wondering, no, I don't flame. The point of ranked is to win, right? That's why, no matter how badly someone is doing I try to be the guy telling people to "Play safe and farm. We can still win!". Being positive is a great help in games, and what could I gain from flaming something pales into comparison to what I can gain by winning. And yet, after having that great (to me) W/L ratio, I can't help but feel like I was shifted into the pit of players that do nothing but complain, feed, and rage quit because of that. My MMR, based on op.gg, was enough to skip S1 at that point, so I can understand it wanting to make ranked more difficult. I like a challenge, but people raging isn't a challenge. I'd much rather face significantly better players than have someone on my team quit. It's like playing a game where bosses aren't actually difficult, they're just "cheap", tossing me in with players like this is just silly.

So why? I've tried solo queue, duoing, everything, and yet I can't win. I'm tilting, farming worse, my KDRs are shit compared to what I used to be able to do, but it's not because I'm against better players, it's because I'm being paired with worse ones. So why does Riot pick this cheap way out? This is why people come to hate the game at times, this is why all the ragers act like they do, they might have been in the same position, and I can certainly understand why they'd be like that.

So what do I do? Normals don't feel rewarding at all, because they really aren't, and I only came back to league because I was out of stuff to play until The Witcher 3. The system is stupid, and I'm gonna have to take a break so as to not become a rager myself. All of the salt I see in my games makes sense now, all because of Riots inability to challenge players.

/endrant