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I'm sure some of them were rather nice, humane even. Maybe they were even, dare we say, liberal? However history has made its judgment and the Khmer Rouge come out on the poor end of that evaluation. And to be fair, just because some of your friends are violent sociopaths doesn't mean you are. But it does at least bring the surface the question of why they were your friends.
For my money I'll take the view of Todd Gitlin who as a founder of the SDS saw it eventually not for what it turned into but into what it always was. After the Port Huron Declaration the SDS movement essentially did nothing and accomplished nothing. There's no shame in saying that. the Weathermen, coming on the tails of that and declaring that more violence is the answer especially when none of the people saying that are actually prepared for the revolution that they want everyone to do for them, is just being blockheaded and dull.
Sorry Bill, I'm sure you're a nice guy. But you're a misguided ideologue and an unapologetic zealot the world has no use for. Stop asking us to apologize to you for that. But I'm sure there's some old Red Army Faction leftovers still in Germany who would support you.