Your question is of a moral nature: what should I do if I break in your house and find out that you are abusing your kids?
This is why they write fiction :) Not so easy to figure out, and it could easily vary by individual and circumstance.
As to advocating for people to become robbers, would I advocate for another Snowden to appear? I think that's impossible for me to answer without answering your moral question, without knowing what sorts of things would be revealed by the crime. Whether I advocated or not, though, it'd still be a crime. Not sure if my advocacy is a crime. If so, then I'm a criminal and the law is an ass.
I hadn't considered whether I would advocate for another Snowden, but assuming being 'another Snowden' implies exposing corruption I would have to say that I would. I personally think that corruption in any form is one of the things holding us back as a species. See Africa for a wealth of examples.
It's not so clear cut though; if I break into your house and find a few joints should that be treated the same way? I suppose it boils down to where on the continuum of severity you place corruption of the democratic process.
Encouraging someone to break into private property looking for evidence would still be a crime, IMO.