Having a gene means nothing. Its the expression of that gene that matter.
Your environment is what controls your gene expression. Healthy behaviors encourage healthy gene expression. The opposite is true for unhealthy behaviors.
The biohacking solution has to be a voluntary decision. It will be a brave new world if we give the state power to do medical interventions against people without their consent. Especially when the intervention is against a person's own genes.
RE: Should gene editing technology be used to remove the violent predisposition?