and again I ask WHY?

I can not even begin to understand such cruel hatred against fellow man, if it's for a full on statement with some issues someone has over government policies then write to a newspaper, vote, call your Senators, but why, WHY would anyone set out to massacre innocents, people who had paid a lot of money to run the marathon for charities, right now, someone is hearing their loved one is never coming home, someone's Dad, someone's Mom someone's brother or sister someone's lover...this has got to STOP someone must know something...someone knew something and didn't act...heartless bastards...