I'm not so sure about "better soldiers", but they'll probably make very iconic war criminals if drafted into the military. the co-worker that revels in murdering babies in front of mothers will surely make headlines.

I wouldn't think these war-criminals come out of nowhere. they probably get their head start in torturing neighbourhood cats, gloating about how much they love meat and don't care about the torture, and how they personally love to bash heads in[1] and murder children in front of mothers.

[1] https://theguardian.com/environment/2020/may/19/millions-of-...