Do humans have inherent value?

[Anomalocaris]

Would you say that someone who does great damage to humanity has value? And if not, would the world be a better place without them?

Therefore, would you, rationally, justify their death, not only due to the harm they do, but also due their lack of value within society?

I think the question begs oversimplification.     But it is not so simple.   One could say protecting any human’s life has a value of its own, if only for selfish consideration that ascribing such value makes it more likely for others to protect you as well.     So the value of human life is the same as the value of protecting that life.

But that is different from saying is a individual person’s net value must still be regarded as positive even if he would use that life to make himself a bane to humanity.

Here is where legal niceties come in.  How to kill a life that clear hurts more than it helps without denying it helps to protect any arbitrary human.