Logic isn't a thing, its a malleable abstract idea. What sociopathy and similar ASPD's allow for those that have it, is the ability make decisions that benefit them the most. Social humans, instead, are capable of maintaining the overall strength of the heard, because they have the involuntary capacity to recognize and mirror another's emotions and situation and will then take initiative to help them. ASPD is functional for a small selection of roles, such as that of the warrior or the leader. Outside of that, an excess in people that lack empathy in a culture can cause serious damage to that culture. Case in point, modern American business.