Could this happen here? Today?-----Ordinary Men: Reserve Police Battalion 101 and the Final Solution in Poland

Amazon.com: Ordinary Men: Reserve Police Battalion 101 and the Final Solution in Poland eBook: Browning, Christopher R.: Kindle Store
“...shocking account of how a unit of average middle-aged Germans became the cold-blooded murderers of tens of thousands of Jews...
...Browning argues that most of the men of RPB 101 were not fanatical Nazis but, rather, ordinary middle-aged, working-class men who committed these atrocities out of a mixture of motives...
Very quickly three groups emerged within the battalion: 

• a core of eager killers, 
• a plurality who carried out their duties reliably but without initiative, and 
• a small minority who evaded participation in the acts of killing without diminishing the murderous efficiency of the battalion whatsoever.

While this book discusses a specific Reserve Unit during WWII, the general argument Browning makes is that most people succumb to the pressures of a group setting and commit actions they would never do of their own volition. 
Ordinary Men is a powerful, chilling, and important work with themes and arguments that continue to resonate today."