For your stance to be correct, it implies we reached peak technological lethality hundreds of years ago. That ignores advancements in nuclear technology, drone

For your stance to be correct, it implies we reached peak technological lethality hundreds of years ago. That ignores advancements in nuclear technology, drone technology, biological technology, ballistic technology etc. People could absolutely kill in prior eras. One of the biggest mass school killings was from the 1800s. That does not mean it isn’t easier in a modern era with more options and more lethal options. To the original point, the biggest mitigation is that people tend to be pro-social, not that technology is inherently benign.