Husband kills family

It's funny to hear what people do when they are not happy and their life is not going the way they want it too... A man who had been out of a job for several months kills his mother-in-law wife and three sons and then kills himself because of not having a job. My question is what would make someone hurt innocent people just because they didn't have a job?
This really bothers me because the family I bet supported him when he didn't have a job and it just makes me sad that these innocent people had to die because he wasn't happy with the way his life was going. What do you think, was it right to right to punish his family for him not having a job? Did he justify his killings by killing himself?


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