If we don't know the person's name, or the context of the person it makes us objectify the person, and as much as we would like to do so... it actually doesn't help us strengthen the collective wisdom of society to prevent this from happening again.
Say the person's name.
Get to know his family.
Get to know the years before they became radicalized.
Understand why they believed this was right as perverse as their rationale is. This is the only potent defense we have against terrorists and their ilk: Grow your mindfulness about the human condition.