Hi Fukushima Meltdown

This is an interesting situation.

What kind of personality disorder might this be: "Feeding off your fear?"

To be truthful I am not sure really.

I did find this article though that you might want to have a read through:

LIFE AS A HUMAN - WHAT CAUSES A PERSON TO BECOME INTENTIONALLY CRUEL:

LIFE AS A HUMAN ? What Causes a Person to Be Intentionally Cruel?

Have a read and see what you think.