It's almost always both genetics/biology + parenting/environment.
Many children who have severe behavior problems have them as the result of a temperament that is particularly sensitive to abusive or neglectful parenting. In general, normal parenting or even lax parenting won't produce a truly antisocial child. They might have some behavior problems, but "evil," no. Most aggressive and oppositional disorders can be treated through parent training and family therapy.
There are rare cases of children whose brains are simply not built for empathy and adaptive social development. This is almost always a result of some kind of subtle brain damage.
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"If ten million people believe a foolish thing, it is still a foolish thing."
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