I've been following the housing bust. In 2009, I remember reading a resignation later by a guy who made his "F * you money" betting for a housing collapse. He blasted the big banks, ivy leaguers, and old boys network. I bought complex derivatives (SRS, SKF) but lost betting against the market. I read http://calculatedriskblog.com for a while and educated myself about the macro factors in the markets. Through "calcula…
For most investors there really wasn't an optimal way to do this, using ultra-short ETFs carried a lot of drawbacks. The best way (which I found and put 50% of my PA into) was to go long a Canadian insurer which had a ton of credit default swaps on most of the levered investment banks.
The other thing I would say is that, unless you are somehow exacerbating a problem (e.g.: somehow creating rumors to cause bank runs) then picking up cheap insurance isn't the same as being the guy controlling the predator drone in a strike. You'd instead be simply offsetting someone else's risk.