“It is difficult to get a man to understand something, when his salary depends on his not understanding it.” -- Upton Sinclair
http://www.goodreads.com/quotes/21810-it-is-difficult-to-get...
http://www.goodreads.com/quotes/21810-it-is-difficult-to-get...
But the only people who seem to refuse to understand the circumstances are those whose righteousness depends on portraying the police as cartoon villains.