It is a question I have wondered about as well.
I just hope that the UN doesn't wait like they did last time. Anyway, I know that you know Satan is afoot and that we must pray and appeal to God and not man. I just realised that. I'm here criticising governments when the real ruler is Christ.
Saddam didn't abide by his post-war resolutions, and he had to be held accountable; he kept shooting at our planes; it looked like he was back to creating and stockpiling WMD; he was supporting terrorists; he was harboring terrorists; there's a lot of oil in Iraq and our country runs on the stuff....
The situation in Zimbabwe is entirely different.
BTW, was your question serious, or merely rhetorical?