Yes, it's a human dynamic. In other spheres of interaction we've evolved mechanisms to cope.

I wrote about this a few years ago[0]. But for the day to day situation, Stephen Fry has made the sensible choice. There's no point drinking from a well people keep re-poisoning.

[0] http://chester.id.au/2013/03/22/why-the-law-is-slow-imperson...