Historically, technological advances of any kind have led to greater casualties, not less. Its never stopped them happening and its never stopped war happening.
You've got this completely and utterly backwards. You know how we have a concept of total war these days? That didn't used to be the case. Nobody used the idea of total war because
all war was total war. Siege the city, eventually break in, kill whomever you want and take what/whomever you want, victory.
Even as recently as WWII we had extremely wide warfare. Some cities were firebombed so much they ceased to exist, and while perfectly acceptable then such a thing is unpalatable for even the most reactionary military figures now. How do you think the world would have reacted if the US had responded to 9/11 by dropping white phosphorous and MOABs on Kabul until there was no structures standing and nothing alive in the spot where it once stood? Yet there are people alive today who were around in a time where such a reaction would have been not only accepted but welcomed.
Technology is a catalyst for both narrow war and the obsolescence of war (through reducing the avenues that lead to conflict in the first place).
I've noticed a lot of left-leaning technocrat types normally embrace transhumanist type technologies, except when it comes to remote control aircraft for whatever reason. You'd think a future where wars are fought with tiny unmanned robots in space would be wonderful, right? It just seems to me that the right wing conspiracy theorists and left wing conspiracy theorists are just drinking each other's Koolaid too often.
Well, I'm a democrat, not a technocrat, though I am a left-wing transhumanist. I'm fine with drone aircraft so long as they're available to everyone (not the armed variant, obviously). I am significantly less fine with a totalitarian AI controlling an entire city, as shown in Self-Aware Colony.