I feel sad

I don't know how to feel after an event like Bombay blasts or the train mishaps. I feel sad. My heart is sinking. Why so many innocent people are being killed. What is the satisfaction in killing people. My mind then tries to find answers to these questions in spirituality. I can't derive any satisfactory answers. But what is our duty has always been the gray area. Shall we be more vigilant? Shall the authorities be more vigilant? Shall we not put more pressure on the authorities to strengthen the intelligence systems? Shall we not ask for stringent punishment for those who have been found culprit?