Earlier quoted context omitted.
People that have been abused are more likely to abuse others. If we remove this cycle of abuse, what is the natural rate of humans that will hurt others? An uncomfortable idea, as victims become perpetrators, it may be best to segregate victims to prevent future abuse and victimization.
People that have been treated well are more likely to treat other people well. If we remove this cycle of decency, what is the natural rate of humans that will hurt others? The premise is flawed, humans learn from their environment and there's really no way to put a human in a coffin until they're 20 and see what they do then.
Yeah, but you can also find that rate if you remove the trigger (abuse) from the environment (society) and see how the rate changes.
You don't have to lock someone in a coffin, or something ridiculous like that (and that would be counterproductive anyway). You create a society, or a least a sub-society, where there's no abuse, and see how much abuse is invented by the people raised in that environment.