And no, the taking of innocent lives is not wrong to me if it saves vastly more innocent lives than it costs

This in itself is violent thinking. Also you are making the assumption that it really is saving vastly more innocent lives. With that thinking, when does it stop? If war is so necessary and productive for creating peace or safety then how come wars have continuously been going on for 6,000 years?

They're definitely naturally warlike, because war arose from nature.

A lot of things could be considered 'natural'. Just because something could possibly fit into that category doesn't always give the reasoning that its justified or right.

You yourself may not be a violent person in action but supporting a violent entity like war is in itself violent as well. And you seem to be supporting a very 'collectivist' idea pretty enthusiastically without being open to consideration of what others are saying on here in opposition to you.