"it's just possible that they come across some expert who is actually willing to help put some scumbag in jail."
Indeed. I have been that very expert. But (a) it was part of my job and (b) it was part of a long-established legal process. It would have been somewhat different if it involved mass surveillance of a sort which has already been struck down in court in a previous guise, which I might fear to be illegal under over-arching European legislation (which, thankfully, still exists to protect us against government overreach) and which, in my view, goes against the long established principle of the presumption of innocence.
OTOH if I found myself in an employment situation where I discovered such scumbag activity I would probably find myself becoming a whistle-blower although oddly enough intelligence agencies don't seem favourably disposed to these.