One could argue the death toll of WW I and WW II would not be possible without large scale manufacturing of firearms and explosives.

But there's not an everyday use case for firearms and explosives for the average person. There's civilian, everyday task that would be easier were better firearms and explosives available

I think the 22 million people who died in World War I, for reasons there is no consensus on, would contest your claim. And that is just a fraction of a fraction of all humans, with their own stories and dreams and loved ones, who have died (and continue to die) in vain to firearms and explosives.