Thing is, you have NO EVIDENCE to prove this.
Can you record 50 games, and prove you get at least 1 blatant smurf every 5 games?
Someone popping off and getting team wipes doesn’t turn them into smurfs. You don’t know if he’s just having a good game. You don’t know if he’s been losing the entire previous 10 games just to pop off now. You don’t know if he’s getting those kills because their team is enabling them. You also probably don’t realize that all those kills have more to do with your team playing bad rather than him playing extremely exceptional. The guy might also be cheating, but you think they’re just good because you can’t differentiate good players from cheaters.
Lastly, smurfs can’t be banned because they’re just normal players playing well. Not everyone is hardstuck in gold for 10 seasons. Some people are extremely talented with great mechanical skill, but stay in lower ranks with low level border just due to low play time or effort. Or some players gets stuck because they play with their lesser skilled friends. You can’t just ban good players.
Finally, smurfs really doesn’t matter because I don’t see you complaining getting undeserved wins when getting carried by a smurf/cheater whatsoever. Same thing with throwers on the opposite team. Do I like them? No. Do I deny they exist? No. Do I lose my sleep losing one sided matches of getting outplayed by simply a better player than me? No.