You are a nontechnical person and stumble upon what appear to be plans for a terrorist attack. You talk to the person about it and they say "Don't worry. is computer game".
A great exploration of this is the 30 Rock episode where Tina Fey reports her neighbor for what ends up being a plan to get on the show 'The Amazing Race'.
The problem is, not knowing any better, you feel obligated to report the activity just in case. Let someone much smarter than yourself decide what is really going on. If you say nothing and someone gets hurt, can you forgive yourself?
As a hacker, I would understand this is definitely a game. But can I really expect the same from non-technical people?