Yes, it absolutely should be. I can’t stand people who think the criminal justice system shouldn’t dole out punishments, but should only aim to rehabilitate people. You folks have absolutely no empathy for victims. Punishments are important, because criminals cause suffering to other people. The entire concept of justice is based on the idea that criminals should suffer at least a modicum of the harm they do to others as payment for their crimes. Over the centuries, we have done away with the “eye for an eye” model of punishment and decided that the worst sentences we can hand down are execution and life in prison, and most people today aren’t actually in favor of execution. Spending your life in prison is a slap on the wrist compared to being murdered.
I’m sure this girl could be rehabilitated within a few years. Under your model, she’d walk free while the parents and siblings of her victims were still trying to recover mentally from what she did to their families. Your lack of empathy for them is repugnant. You should feel ashamed.