That wasn't our primary motivation, no--but certainly the US tried to make the human-rights case for intervention as a secondary casus belli behind the war. Saddam had a pretty abysmal human rights record, that much is for sure. I agree with you here in part (about future generations suffering here)--but I guess my point is that: it's the Middle East. Whether we went in or not, they're going to suffer. It's a sad reality, but what can we do about it? Clearly, forcing a liberal democracy on their society was an abject failure.