I figured there's no right or wrong answer to this question. Both sides are right and wrong at the same time.
People at those peace rallies have probably no idea what it's like to live in a dictatorship (of course not, they are allowed to express their opinion in their country). People supporting war have no idea what it's like to have their house bombed out and relatives to get killed.
Is war a good thing? Hell, no!
Is Saddam's regime a good thing? Hell, no!
Can the world get rid of Saddam without a war? That's debatable, but my feeling is no.
I can only hope that if war does broke out (at this point I think it's inevitable) it will be short with a minimum amount of casualties (except for Saddam) and at the end will result in a democratic Iraq.