Leadership in the broader sense. Opinion-makers including elected officials, TV talking heads, talk radio hosts, cartoonists . . .
I think JFK contributed his share. His promotion of "unconventional warfare," the romanticizing of the Green Berets - - there was an ethic that glorified success, "winning," at all costs, bending the rules. All facilely justified because "the enemy" (supposedly) was even more ruthless. "We" had to be ruthless because "the enemy" was ruthless. That was the key. The judgment of one's character suddenly slipped from a more absolutist view of right and wrong to the more relativistic one of, "It's OK, as long as you're not the worst one." This was fictionally supported at more or less the same time in the Ian Fleming novels featuring "James Bond," British Special Agent 007, with a "licence to kill." Before Bond, nobody - - or at least none of the good guys - - had a licence to kill.
We have this decayed moral sense because our leaders themselves reflect it. Change those leaders. If they are politicians, vote them out. Morality is a prime qualification. Our leaders reflect us - - if they permit torture, who can keep our own men from being tortured in return? If they are talk show hosts, denounce them, don't buy from their sponsors, DRIVE them off the air. If they teach, walk out when they preach torture and murder. Protest to the administration - - you pay to study law, not to learn criminality. Speak out and act out against this moral rot wherever you find it. Men sacrificed everything so that people like Dershowitz would not rule this planet. The least we can do is denounce the guy and try to make his life a living hell.
I think we (Canada too) need leadership with moral backbone - - REAL morality, not this "abortion is criminal" "gay life-style is wrong" kind of morality. We need someone to say from the top, "Shit like this is WRONG, and it won't be tolerated. I want laws passed that permit capital punishment on offenders. I want the ability to dismiss commanders who let shit like this happen on their watch. Bust 'em down to pfc and they don't get any pension either. This is gonna STOP NOW." THAT is the kind of leadership we need, not someone who denies, minimizes, excuses. Leadership that can make heads roll. Literally.