A lot “low functioning”‘ children (those with ventilators, G-tube, greatly reduced cognitive function) don’t have a genetic disorder causing that. They had some insult at time of birth causing anoxic brain injury, or they meningitis, or some other issue that isn’t genetic.
For those with severe behavioral disorders and violent behaviors, most of those do not have any specific genetic disorder.
Sure, you can catch some things with genetic screening, but most of the stuff that results in what you’re worried about isn’t genetic in nature.
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