I'm sure people do, but they're wrong. There are always situations in which the use of force is rationally self interested. As such, as long as those situations exist, a rational people will maintain and use war capability. Asking people not to go to war is asking them to put emotion (empathy) above rationality. You can do it to a degree, but only to an extent.

Indeed, US hegemony is good for peace. You can eliminate the rational self interest in going to war by imposing an external cost to going to war (like any negative externality). That's the role the US serves. Its military machine implicitly backs things like international sanctions that are punishment for anti-social behavior.