Criminals - by what standard? Its better to come up with rules and services to help people to make better decisions. The problem is how you come up with policies that allow freedom, but also deliver some signals.
You're probably right, from an anarcho-capitalist view anything which is profitable is ultimately beneficial to the greater good of humanity. People separating sheep from their funds serve natural selection, that's why I have opened a thread to keep the sheep informed, I can see guys hearing about the BTC boom in the news, hanging around on the forums for a week and deciding to invest their savings into pumped up penny coins in hopes of paying up their mortgages. It's like Wall Street on steroids with no legal repercussions.