This is an inefficiency of the market. You must have some level (perhaps not rigidly set) of inefficiency at which you would conclude that some type of government regulation would make the market more efficient.
Otherwise you'd accept any level of inefficiency as the market working, at which point it's just an ideological label.
Although it's not clear that regulation of bitcoin is even possible, we can still consider losses due to its absence.
What makes you think the government can run an economy?
Our economy, despite recent "deregulation" is the most regulated, especially when you count criminal and civil law as well, in the world. There are countless laws against selling known-bad products (lemon cars, toxic mortgages, etc) and we could have almost everyone involved in the recent collapse behind bars if we tried.
We pay through the nose for the regulation, especially in the collateral damage from false positives and economic friction, and it's totally worthless at catching the biggest criminals (in terms of dollars stolen) in world history.
If I want regulation I can use a regulated exchange. Or rather, if I felt like using beta-software I'd be doing it and would be thankful to be allowed even if I had just lost my test fund. Forced regulation would remove the choice.
And ultimately regulation implies that rules stop the bad guys and we know that's true. Thanks, but I'll wait until an open-source and audit-able exchange comes along, and then I'll listen to the experts I respect.
Otherwise you'd accept any level of inefficiency as the market working, at which point it's just an ideological label.
Although it's not clear that regulation of bitcoin is even possible, we can still consider losses due to its absence.