Sick Minds

I've just read that there was a bomb-threat today at Eniskillen, the town in Northern Ireland where a bomb killed 11 people at a Remembrance Day parade 30 years ago.
This horrific event gave rise to the Peace People, whose founders, Betty Williams and Mairead Corrigan, were later awarded the Nobel Peace Prize.
I just cannot understand the mentality of someone who could make a threat of this kind.