You just said you disagreed with the decision because killing her is somehow a "get out of jail free card". You are literally saying you want her to suffer, that freaking DEATH isn't enough. That's sadism, and about as black-and-white thinking as you can get.

Her suffering won’t bring the kids back. Maybe ask yourself why you take immense joy in another human’s suffering?

Because gun nuts like to pretend that all "responsible" gun owners have iron-clad mental abilities and emotional control. It runs counter to their objective to admit that a legal gun owner could lose it in a moment of distress and use his legal firearm to murder someone.