Why ban allied Yasuo players?
Because this is what happens... every... single... time...
http://i.imgur.com/jUsG0kR.jpg
Even worse, is when they don't get him, the enemy does, then the enemy Yasuo becomes god.
I mean I tried. I really, really tried. But come on, less gold than the support... I try to never ban my allies picks. But I completely understand why some people do. Basically if your top laner picks Yasuo, just expect to lose. If your mid laner picks Yasuo, expect to lose. It's as simple as that.
My one and only ever pure sodium thread but. I just... I can't... Please, permban Yasuo if he isn't on your team, so hopefully you saved some other poor soul from a miserable game.