No attacking please, unless they attack us first or a "friend" such as Great Britain. Or, you could argue, our interests, narrowly defined. An example, might be someone deciding on their won to "take over" the Panama Canal.
Scanning over a globe of the world you see many many scumbags, some with even nuclear weapons or the capability to be so in short order (read: North Korea). And, many hate our guts!
So? That doesn't mean you automatically go and attack them!
As Sirs correctly notes, however, the intel for Iraq was pretty firm, e.g. we felt he had WMDs. Okay, I really do believe that , just as I believe President Bush really believed it all, just as I probably would have. After all, it really did LOOK that way. Ok, got it so far?
Here is where we differ. Just because Hussein is a scumbag and just because he has WMDs (apparently) and just because he hates us, DOESN'T MEAN YOU GO AND DEPOSE HIM!