Sub-prime mortgages which largely precipitated the meltdown were the creation of Wall Street and enabled by deregulation of the financial industry.  

And it was the Republicans who enacted said deregulation, not left wing governments.

You are right that people who leveraged questionable financial instruments to fund a lifestyle they couldn’t afford are partially culpable.  But regulation of the financial industry is partly to guard against malfeasance by investment bankers, and partly to protect those who haven’t sufficient sense to protect themselves.  This is why we have laws against usury.

If the business community has more knowledge and ability they certainly haven’t shown it.  They architected the last financial crisis through greed, and I believe we can expect more of the same now that Trump will be relaxing the few controls in place.