You're right, it is very unclear. My concern (and what seems to be Snowden's concern as well) is that business is going to keep going on as usual and everyone will let this slide.
I don't think its your duty to do something more unless you really want to change things. That being said, doing something to really stand out, like boycotting those PRISM companies until they change their policies, wouldn't be in the fiduciary interests of your investors.
It's a tough position to be in I think, and that's why I think it's bitter sweet. Mo money, mo problems.