Like it or not, the Civil War killed ~50k Americans/year, which is significantly less than the ~100k killed by fentanyl last year. Half of those with dysentery would have died with dysentery at home, and everyone with syphilis would have.
Aww, did I cherry-pick data to support an argument, and have data to back it up, despite what "everyone knows" to be the truth? Well, I sure am glad nobody else did that anywhere in this thread.