You know that banning stuff is evil, right?
You are welcome to make a personal decision not to exchange BTC for certain things, and to exhort others to make the same decision. Personally, I don't spend Coin on gambling, nor on mind altering substances, and I would encourage other people to make the same personal decision. But it would be an immoral act for me to try to actually restrain them from doing so. Trying to ban people from gambling, using mind altering substances, or exchanging Coin for fiat would be an act far, far more evil than "market manipulation."
Now, I am not here to force my morality on you, but can you see that you are proposing to force your morality on other people? Give up the use of force! Those who live by force will justly suffer when force is used against them.