There's probably all sorts of complex psychological reasons for someone to kill their family. If I recall correctly from the last time this topic came up men are far more likely to kill their whole family than women. As I also recall, where women kill their children there is usually mental illness involved (such as post natal depression of a severe kind) whereas men who kill their families are more likely to be acting on different impulses, not governed by insanity.
Why would those men kill their families? Like I said, there are probably all kinds of psychological factors, but mainly I think its because we are at our core, just another animal. Look at the animal kingdom and you will find plenty of murderous mums and dads.
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