Here is a better lesson: Store your money somewhere an entity with the strength and resources of the US Government guarantees you against fraud or mismanagement.
If my bank blows up I will get my money back.
I understand that many of you may not trust the US Government, but I do, at least in the matter of FDIC insurance. I don't trust the kind of people who work on Bitcoin; I believe they are generally "survival-of-the-fittest" type people who will blame the victim for not being sufficiently well informed if they suffer some kind of a loss. The next time an exchange fails, regular people will lose their shirts again but bitcoin aficionados will still think they are at fault.