Yes, one simple reason for USA to invade Singapore and liberate all the oppressed civilians. Trust me, the reason is more convincing than that of the Iraqi masterplan.
1. Singapore has weapons of mass destruction. PW effectively reduces all JC students into dim-witted, whiny and sleep-deprived zombies. PW must be eliminated at all costs! It shall not be used against any other human being. It is against humanity. This calls for WAR!!!