Because that's what was said, right? That no former POW should be president... Couldn't be McCain's temperment which might be a problem? And certainly, no questions should ever be asked.... no matter what the indications that they should.
Since when does the military let in felons, btw?
Felons cover a HUGE swath of crimes, all of which are not indictive of an inability to serve. And Felons always have served. Just when recruitment is way up less or none are waived. That is the way it works.