Possible solution for champ select trolls

I would really like if some rioter read this and if you share your oppinion guys :) In last few days, champ select trolls, became pretty comon in my games, and I got really fed up. I am not talking about those who treatens to troll if they didn't get wanted role, after getting autofilled, those are pretty rare, I am talking about people that bans others DECLARED champions, just becase they can. If this isn't enough, after banning my champion most of them would just treat me like I am retarded, telling me that "they didn't see", or that "they missclicked", even tho that you can SEE witch champions are declared even in the banning phase, and the system warns you about that, and you can't missclick twice in a row (you have to click on the champion, and then on the ban button to ban it). And once, one guy actually was honest, telling me "he hates champion I wanted to play", so he thought he had right to ban it. I know that riot can't do much to prevent trolls away from the game, because if somebody wants to troll, he will troll! Also, I know that it would be bad idea if they add pre-game report system, people would take advantage of it. My solution is that declared champions cannot be banned by your teammates, but only by your opponents. This is not only protect you from your teammates, it will reduce banrate on champions like Yasuo, Zac, and others witch should be that way tbh, even tho I DO NOT play them (at least, not often xD)