Why do people care about smurfs? I played a lot of CS GO before coming to league and climbed to Legendary Eagle Master all the way from Silver 3. I learned along that journey that playing against smurfs is a good things so that you can learn from what they do. Another thing in CS GO that was more reliable that playing against smurfs was playing on a 3rd party matchmaking system like FaceIt, ESEA, and CEVO. Playing on these servers you would most likely play against high elo players like myself when you are only low level. I did this back when I started my climb to learn from the better players.
Now come to League where I'm S4 atm and have the goal to climb to diamond in season 6. In normals there is a high chance for me to be playing against multiple gold and plat players because of my mmr. Do I get upset when this happens? Hell no, if I lose I learn from my mistakes and see what they did right. When I win I feel a sense of accomplishment for winning against people higher elo than me. Do smurfs matter in this game? Hell no, if you're getting upset about a smurf losing your promos for you then you're simply an idiot. You lost to someone that's better than you and don't deserve a higher rank if you can't learn from your losses.
Now onto the smurfs that rage. If they get upset at someone in an elo way below their own, then they're just another bronze 5 shitter who cares about games that aren't on their main. For example, and back to CS GO, I have a smurf account that I played on with my friends that were way below my rank. I never cared about what would happen in those games, and would normally restrict myself with which guns I could buy. Again, if someone cares about a game that is way lower elo than their main then they just have a shit attitude and deserve their accounts to be temp banned for such idiotic behavior.
Just my little rant. I hope I didn't offend anyone unless you're looking to be offended. In which case you're just another bronze 5 shitter.