A full 1/6 of all people have a degree of sociopathy.
Your colleagues who do as little as possible while always shifting work to the colleagues they later blame for the mishaps: a small degree of sociopathy.
Zimmerman, bragging on Twitter about his ability to shoot a teenager, exhibits a rather larger degree of the same affliction. (See this thread here
But what worries me is that there are systemic shortcomings in the structure USA society that seem to encourage that behaviour rather than discourage it:
Scaremongering against fellow Americans (PoC, Latinos, gays)
An educational system that allows such scaremongering to be embedded into the lessons
Ready availability of weapons
Worshipping of vigilantism (Batman, Iron Man)
High degree of heteronormativity in conjunction with 'masculinity' expressed through one's ability to overpower someone else
An economic system so rich in volatility and income disparity that it breeds violent discontent
DU'er Politicub added the following observation: the U.S. labor market - with the increase in temp and contractor jobs - tips the scales in favor of those who treat people like playthings to be thrown away at will.
And the list goes on and on.
We need systemic changes. Lots of them.
Zimmerman is not an outlyer - he is indicative of systemic failure.
DU'er JustAnotherGen suggested that my response in the thread cited above be turned into an OP of its own. While I seldom post OPs, I am happy to oblige.