In the future, we should not use humans anymore in wars. Instead, we should use robots as they are way more efficient and prevents millions of human casualties.

Wars and fights will always exist as it is in the human nature. 

Human casualties can easily be prevented when using robots.

What do you think about this?

What if the culling of the herd was always the point?

That's originally Nicola Tesla's argument, expressed in his article for The Century Magazine, June 1900.

As you can see, nothing changed. Except that now drones kill people too.

Oof, that's a dark take, and not easily dismissed.  I think growth is part of all nature though, so hard to see how created culling is helpful vs evolutionary culling.  Is war evolution? Another rabbit hole.  I do think robots will enter war, but war isn't about killing more of the other person, it's about power.