Earlier quoted context omitted.
Businesses fail all the time. Most startups fail. Should we have more startup regulation? Failure is a normal part of the market. What's really scary are the businesses that are never allowed to fail.
There is a reason the SEC mandates you be an "accredited" investor with at least $200k income in the last 2 years or $1M in assets, excluding your house. How many customers ("investors") would Mt. Gox have if that same regulation was applied to them?
People using Mt.Gox were not investing in Mt.Gox, they were investing in USD and BTC, and allowing Mt.Gox to hold it for them.