What make a man kill his children with a gun and then hisself?

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Here is the beginning of a very sad story KANSAS CITY, Mo. - A man killed five people, including three of his children, before fatally shooting himself Saturday, and a fourth child has life-threatening wounds, police said. The man killed one woman, apparently his cousin, then went to another home and shot his longtime girlfriend, their four children and himself, Capt. Rich Lockhart said. Police did not immediately identify the shooter or the women. Relatives identified the shooter's girlfriend as Shanika King, who was in her 30s. The slain children were a girl, 14, and two boys, ages 1 and 11, police said. An 8-year-old boy was in critical condition with a gunshot wound to the face. This has been going on a lot lately, If you love someone how and why would you kill them? I can't see me killing someone because he didn't love me but as you see there are many people who can kill for love.