I see no reason to regulate bitcoin. The government can not control its turnover. Until there is no trade for bitcoin States have nothing to lose. Users change bitcoin to Fiat and it supports the economy of the state. The government receives income taxes and all is well. Regulation of bitcoin can only drive it into the shadows.
Have you seen Japan? Do you know Japan has legalized bitcoin? It means Japan has regulations regarding bitcoin.
Regulations aren't always bad for bitcoin development as Japan has proven it, bitcoin thrives in there.
But in most countries, it's better to not have regulations about bitcoin or exchanges specifically, just like in South Korean which causes people could transact/trading bitcoin freely as long as they don't violate financial regulations, not illegal transactions such as money laundering.