Some countries were already banned bitcoin, and here in my country they did not banned it not because they don't know what to do but they find bitcoin as an interesting and a great opportunity for the people, and a big help in our growing economy.
That's true even there are countries are banned bitcoin, there are country will still support bitcoin. Maybe their reason is that they could not get some taxes, or else they dont really know or understand the benefits of bitcoin, so the government bans bitcoin.