This may have been asked in the past, but I didn't see it, so bear with me.

Here's the situation:

BillyJoeBob is a hacker. You know him person, and know that he plans something destructive. For example, a series of DDoS's against the Red Cross. You know that he is capable of carrying out the attack, and that if successful will do a great deal of damage.

The question:

Do you feel any moral(not legal, but moral) obligation to :

A: Stop the attack
B: Report BillyJoeBob in order to prevent the attack


Disclaimer: The aforementioned scenario is entirely hypothetical. If it bears any resemblance to actual events, it is only through sheer coincidence and my own bad luck. Thank you for playing, please keep all hands and arms inside the ride, and do not feed the animals.

-Keisha