I'll be covering points others have already brought up. Some new stuff. I see it as combination of:
1 - America is "rest of the world." On purpose. An experiment of sorts, with a creed along lines of:
Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tost to me,
I lift my lamp beside the golden door!
2 - Coupled with history of overcoming tyranny, as if that is fundamental to 'getting things done'
3 - Plus living, even to this day, with history of slavery whereby hypocrisy of 'all men are created equal' was exposed, and then utterly ignored, downplayed for oh 150 years (and counting)
4 - Plus war on drugs, that actually perpetuates the problem, increasing demand
5 - Plus mini, unspoken 'wars,' on anything considered sinful or problem needing to be attacked
6 - Added to by 100,000 Nancy Grace types who's utter mission in life is to see the guilty people get harassed if not going away for, well, forever
7 - Topped off with reality that opening a prison is actually pretty good business. Like urban housing where the more tenants the better, and the longer they stay there, oh boy, profit is to be made. Yippeeeeeee!!!!