I get the sentiment, and yes rule of law is what we should strive for.

But if somebody murders an active serial killer, my internal desire for practical improvements to human well being keeps me from getting too upset about it.

And yes it’s illegal, and if the system is working as intended, the assassin will go to prison. Maybe the people intervene via jury nullification, maybe not. But if conditions are bad enough, individuals can choose to live as a hero in prison rather than as a desperate anonymous poor person.

I don’t want to see children lose their parents even if their parent is a scumbag CEO, but I want human civilization to heal and flourish even more.