Blasts in Delhi

Absolutely shocking. Things are unclear right now, noone knows who did it and why.. but right in the middle of crowded markets, in the festive season.. it's just so awful.. Just a day back I was watching Black Friday, a movie on the Bombay blasts n i was thinking.. y wud someone want to kill innocent people to avenge killing of innocent people.. would you know if people killed in the blasts would be of some X religion or Y religion? What if you end up killing more of your own people? What sort of twisted minds can commit such acts.. and just look at the whole way of doing it.. Saturday evening.. just 2 days before diwali.. in crowded packed markets when there would be the maximum number of people.. God... y does this happen