Don't forget the 19th century.
Oh... don't forget the 100 years war...
And the 1630s... What a mess of people killing people.
No video games then, either.
Obviously, since the comparaison comes from the function of the brain, we need to compare intra-species — not violence, but murder — among mamalians only.
And Grossman was not talking about war machines, but about individual massacres, and about the reluctance of individual riflemen to aim to kill.
So what’s your point about the 19th century or the 100 years war?