They haven't seen or talked to their son/brother/nephew in years, and yet can get on tv and say they never saw anything that would make them think he had anything to do with AQ.
Well, how the heck would they know? A lot happens in 3 or 4 or 5 years.
You are 100% correct, everytime someone is on TV for a heinous crime you always hear neighbors/family say not him!