When war is excused, for any reason, it is a sign that civilization is failing. It's the exact same thing as college sports.
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When the only way to resolve matters is with bombs, then we're all going to die in a war. I don't understand why the US doesn't just impose sanctions on Syria. Seriously, wtf are they going to do, bomb the place(s) that are producing chemical weapons? I guess that's one thing they could do, but how about simply go in and try to talk it out? Or stay the hell out of the way? If the US puts itself into their war, then won't that make more people hate the US, and in turn, create more reasons for terrorists to try to fuck with the American people?
So you're saying that everyone should have stayed the hell out of the way in Rwanda when the Hutus decided that the Tutsis population didn't need to keep living. I think that the shame then was that the UN and international community waited 100 days and let over a million Tutsis people die before intervening. If you're going to call the intervention and subsequent war against the Hutu government a sign that the civilation is failing then you have no sense of decency. An analogous situation arises in the Bosnian civil war.
Economic sanctions don't always work and for some countries aren't effective. It's not going to hurt Syria if they don't buy anything from the US or can get what they need from the black market. Unless of course, you're suggesting that we blockade all commerce to Syria and slowly let the population starve.