The Son Deserved a Longer Sentence
Early in the movie we see that the girlfriend is still alive when she's brought into the hospital.
That means after accidentally pushing the girl onto the jack during the fight the son left his girlfriend to die a prolonged death in the snow. He didn't even try to help her or he would have seen she was alive. Instead the son dug the car out of the snow while his girlfriend lies there right next to the car slowly dying.
Then the son drives the car home. Then he runs away. His girlfriend is still alive. But he never calls 911. At no time does the son tell anyone (including his mother who's a doctor) so the girlfriend can get help.
The girlfriend dies hours later in the hospital. If the son had gotten help right away it's possible the girlfriend could have lived.
If the girlfriend had died instantly I could have gone along with the 5 year sentence for involuntary manslaughter. But for the son's depraved actions afterward --- leaving his girlfriend to die --- while not trying to get help for her, I'd call that Murder 2 and have given him a much longer sentence.
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