The Judicial(?) System

I was listening to the radio on my way in to work this morning and the news was on. The newscaster was talking about a man from a city close to here who had robbed, at gunpoint, two banks in my town and one in another state. He was sentences to 47 years in prison without parole. So let me get this straight: A man robs a few banks, steals some money and gets 47 years in prison and Mary Winkler shot her husband in the back, killing him, grabbed her three girls and ran and she got a little time in a psych ward? I guess the insanity plea doesn't work when it involves large sums of money. What is this country coming to?