He's not just an investor, he's also a philanthropist. Does intentionally undermining markets through dishonest public statements jibe with all the nice stuff he's done?
He made much of his wealth through currency speculation^. Profiting when entire countries or regions of the world were in economic trouble (arguably hurting those countries). I think it's quite a rare skill to consistently be able to come out ahead speculating on currency. It's really all about speculating on global politics and economics.
I think he's trying to make up for it in his philanthropy. Personally I think a thief is a thief. Robin Hood or not..
As for him stirring the pot and making a statement. It's his right to do so. He'll make money no matter what happens to the economy. Though I would suspect he'll make more if the recession continues. My guess, he knew exactly what he was doing when he made this statement.
US charitable foundations (Carnegie, Welcome, Gates, most private Universities etc) are there to make money for their cause - they do not exist to do good in the markets or only invest in 'nice' companies.
When a stock market pundit, wether they work for Soros, Fox News or XYZ charity publishes something about a sector - it is because their employers have an interest in it being beleived.