I wonder if he was part of the Occupy Movement? He sounds a lot like they do with regard to foreign policy. Funny, it looks like he falls on the side of Radical Muslims and Lefties. (We need to check the photos from Occupy Boston)
It would be totally easy to recruit someone with an already warped worldview of America/capitalism, no belief in God, PC correct morals etc.
They are weak minded and are easy prey for all kinds of weird philosophies ... Radicalizing them is like writing on a blank piece of paper.