Hell, let's just start off by banning everything that may pose any kind of risk and then only unban the things that are deemed safe and positive by our unbiased and benevolent leaders.
Although I'd rather biased people tell me I can do things than tell me I can't. Then I can make my own choices.
I'd rather err on the side of personal freedom, especially when those trying to decide how we live our lives may have an agenda. That agenda could often even be promoting a different industry's interests, for example banning internet poker was heavily pushed by the brick and mortar casinos.
We should. Diacetyl is quite dangerous to inhale.