As I said, I think the mass graves and the thousands murdered by Saddam with chemical weapons, various means of torture, etc do make a very good case for protecting those who cannot protect themselves.
We went into Kuwait in 1989 (Gulf war I) to undo Saddam's invasion of a neighboring country. That conflict never ended. We had only a cease fire , but we had obligated ourselves, as did the whole international community, to make sure that Saddam could not threaten his neighbors, etc anymore.
Saddam was in constant violation of those cease fire agreements.
We kept our obligation. Much of the rest of the 'civilized world' got cold feet when it came time to act.
I think keeping our word, even when deserted by many of our 'friends', and protecting the defenseless are consistent with Christian principles.
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Here's some Ed Koch for ya, if you haven't looked him up yet.
Yeah, I know he's a right wing, Republican hack, right? Read him anyway.
from
http://www.jewishworldreview.com/0905/koch.php3
Of course the major flaw with Koch's idea of 'leaving the UN in charge' is that they won't do it.
The terminally cold feet of the UN when it comes to dealing with Iraq reveal it's ineptness and it's uselessness.
The money saved by closing the UN could do a lot of good elsewhere.