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Nicholas Cruz deserved a world that didn't have these problems.

I'd have to defer to those impacted by his actions and support them in their decision.
Likely had he killed my kid, I would have wanted his head.
If I am on the jury of his killer, he would likely walk free.

We can't know how the butterfly flapping it's wings affects the wider world, we can only do what we think best in the moment, and then deal with the responsibility of our choices.