What an astounding lack of empathy on this thread. 
so if someone commits a crime all of those around them should be found guilty as well? denied the opportunity to grieve for the person they thought they knew? be made to pay the price for the wrongdoings of that person? how very narrow-minded.
This woman has lost her child. Perhaps she lost him last Friday during the shootings, or perhaps she lost him at the point he became radicalised, who knows. There are plenty of people who find it unbelievable that a friend, family member, son, brother, sister can become radicalised in such a way, even the friends of some of the latest family who have gone to Syria believe that they were tricked into going.
Anyone has the capacity to do wrong, be that to commit a horrific crime such as shooting a group of innocent people or even having one too many on a Friday night and then getting behind the wheel of a car and killing an innocent person on the roads. And every time someone commits an act which goes beyond our own moral compass that is someone's son, daughter, brother, sister, and then they too become victims.
We bring up our children to be decent citizens, to do right by those around us, and we hope that they will continue doing so into adulthood. But as our children grow, so their influences expand to beyond just that which we provide. Our children are not carbon copies of ourselves, and any one of them can fall under the wrong influence. And while as individuals we are all responsible for our own actions, we are not responsible for the actions of others.
There but by the grace of God go any of us.