Another Suicide Bomber!

Yet again large numbers of people have been killed by a suicide bomber….this time at the Marriott Hotel in Islamabad. Can anyone please explain to me in words of one syllable why anyone feels it is right to go and kill such innocent people in the name of their ‘religion’. We have had such instances closer to home in Ireland, but at last there appears to be a recognition that ‘talk, talk, is better than war, war’

Can someone enlighten me please?