I work with tiggerific, and to be honest I wouldn't have felt that good about the child being allowed into the flight deck. Just because it was a child, doesn't mean he wont do any harm...chances are slim but still...doesn't anyone remember that young boy strapping a bomb to himself in Iraq?? Fair enough we're not in Iraq but in the age of terrorism I wouldn't like to take my chances. As for the First Officer being the only one to challenge the Captain...I don't think so. If the SCCM feels the Captain may be putting the aircraft, passengers and crew at risk, he/she has the right to say so.