The US should not be in the position of "World Police" at all.
You're right, no nation deserves to be exterminated, not even the Muslim nations you hate so much.
I am not sure why people hate the Muslim nations. Yes most/all terrorists from the Middle East are Muslim, but not all Muslims are terrorists.

Define wrong reasons. It's all perspective. I'm sure Palestinians would believe that Israel has intentions of using WMDs for the wrong reasons. Heck, they seem to be intent on killing any peace plan and have no interest in compromise and sharing (that all purpose concept we got taught as kindergardeners). Personally, North Korea is less likely to use them than Israel. Israel has gone even further hardcore than I thought they would and it is making the Middle East even more unstable.

But maybe it's me...
Isreal is directly making the region unstable, but the US started it. Someone had the brilliant idea after WWII to carve out a small portion of countries that hate Jews and have "Jew haterS" on three sides and water to their backs. The US is quite hypocratic, and has been. The way our foreign policy of do whatever suits at the moment; the CIA makes these situations, then makes another when trying to clean up the last. This will go on for a very, very long time. The US needs to change its foreign policy, a lot.

-Cheers-