According to the "news" report you posted, it was not definitely a stolen aircraft, and they are not sure if it was involved in the "medical emergency".
So why do you think it should be intercepted? Are we all now guilty until proven innocent?
Maybe in YOUR "post 9-11" world some flurry of activity to intercept (and maybe shoot down?) this aircraft would be the way to go - but not in mine.
What world-class catastrophe would this have prevented?
booger2