"so as long as businesses run ethically and control FIAT responsibly......."
Yeah, right.
Leave Bitcoin alone anyway.
your depth perception seems limited.

personal bitcoin transactions will remain free to do whatever they want. same goes for personal loans, and other peer to peer stuff.. but businesses... ACTUAL businesses do need some ethics.
take BFL for instance. wouldnt you even agree that if BFL didn't do the 1 year 'pre-order' but instead only offered pre-orders for no longer then a month (which is an acceptable reasonable time in regards to BBB policy) then consumers would be happier.
take intersango for instance, if as a business they had to register a business with companies house and get audited, wouldn't you and everyone have been happier that they were legit and be held legally accountable
in both cases these 'companies' acted like dodgy hobbyists taking large sums and acting like they are not accountable for anything.
this is not about bitcoin. this is about businesses treating customers correctly
The best protection for consumers is competition which is exactly what regulation destroys.