It’s not *supposed* to happen, but of course you can find instances where it does.
Some judges like to hand out longer sentences. Some are<span> just corrupt</span>.
It’s also possible that having the victim survive can work against you as they can now testify against you. An emotional plea from a victim can get a judge pretty worked up.
I don’t remember where I heard it, but a lawyer once advised a client that, “If you run someone over, be sure to back over them again and finish the job. Their family will get less money for a corpse than for a disability.”