I do not blame you one bit. Those suggesting that NEO-BEE was an obvious scam either are insiders that are in on it, or they are just spouting off rubbish. This does however highlight a problem with Bitcoin Securities in that there is little recourse once these come to light. All the due diligence in the world cannot protect you from a clever liar. This is why we need the heavy hand of government to start regulating these Bitcoin securities.
Libertarians are deluding themselves if they think a world with minimal government would function. Such a world would be very inefficient for investors and we all would be spending large amounts of time on due diligence for each of our funds only to find out we have been lied to anyway. Investors would soon all become leery due to high amounts of fraud and losses, and investment capital would dry up. Investors would retreat and progress would suffer.
Even with overseers fraud still occurs (Madoff), but on a much smaller percentage overall scale than with Bitcoin securities. I too will not be putting any further BTC into Bitcoin Securities until there is some better and proven vetting process in place. No process is 100% effective, but until Bitcoin Securities approach an acceptable level of trust through vetting by a commission it seems too risky to consider investing in them.
What can the state do to prevent these kinds of scams? Why can't that service be provided through voluntary interaction?
Why do you suppose you have a right to invest without "spending large amounts of time on due diligence?"
Somebody has to put the work in to do that "due diligence." If it isn't you, you'll have to pay a premium for that service. By suggesting that the state should be responsible for this, you are advocating the use of violence against your neighbor in order to force him to subsidize your investments..
I think it's worse to bake violence into the system for the purpose of protecting idiots from themselves.