For some, perhaps, it's as simple as that. For others it's actually a bit more subtle. The big banks were bailed out using someone else's money, but are doing far too little far too slowly to make sure that either (a) they pay the money back and (b) make sure it doesn't happen again.
A good number of the protestors in London, at least, are protesting that more needs to be done because that money could be much better spent elsewhere right now, rather than on nice chunky bonuses to bankers.
Of course it's much easier to pick out the protestors with the unrealistic or weird goals and dismiss everyone who protests as a smelly hippy, but I do think within the protest there are some realistic and sensible goals.
And people are starting to take notice, and nobody's felt the need to set fire to anything.