Even I don't want the cancer that is teemo on my team.
Even if I have a first pick jax, I still ban jax cause odds are this person doesn't have that much practice with the champion (how many ranked games will they get where they can be a jax?...) and they're better off using a jungler that they have been using in the 99% games where jax was banned. Honestly I don't even ban the usuall bans because they're broken, especially since most of the time they're not good for the previous reasoning, but because of these instances were my allies may choose them with little practice outside blind pick, where nobody really does ranked strats.
I don't know what you're going for but I honestly don't blame people when they do this. I blame the pick if they just whine and feed on purpose because they didn't get the broken champ they desperately need to win.