-Bitcoin could facilitate assasinations, which would likely make more people mind their own business and be polite.
Any kind of envy would immediately be deadly. Any kind of attention could potentially be lethal. We would thus walk towards a society where everything abnormal (no matter whether great or gruesome) could only be done anonymously, with everyone trying to appear as average as possible.
Also, "Dancing with the Stars" would have to be renamed to "Mark your next Target".