Bitcoinica was a great thing, that could strenghten bitcoin economy. Everybody know that there was a substantial risk. But we have situation that nobody predicted: no offline backups. That could be avoided... But it's a fact.
Maybe only a few would have considered the possibility of a commercial site dealing in tens of thousands of dollars in value every day as not having the basic sense to have offline backups, and not give out root passwords to anybody who stops by THE FIRST TIME.
When a similar, and highly suspect repeat happens a matter of weeks later? Every single person who sent a penny to this service should have been thinking about it. And given the history of the brain trusts that think profit can be fabricated from thin air, I suspect that there were a considerable number who actually were PREDICTING a similar failure, and not investing in this shaky gimmick.