Spare a few notable conflicts (ie Taiping rebellion, the US civil war, Crimean wars etc) 1815-1914 was relatively stable from a historical context. The post WW2 order has been even more stable with deaths near an all time low relative to global population. We are currently near an all time low.
We've only had historic lows in military deaths, since the Rawandan Genocide btw. Prior to that, deaths per capita had been trending down, but it was trending higher than historic lows which came at the end of the 19th century, the end of the 17th century and most of the 13th, 14th and 15th centuries which saw large portions of those centuries seeing around 2 deaths per 100,000 people. Of course these are best guess estimates. At the end of the 17th century, we see a drop to around 1 death per 100k following the War of Spanish Succession, and then another drop to about 1 death per 100k at the end of the 19th century. Military death rates have dropped to obscenely all time lows, with about .1 per 100k in around 2010, but it has climbed up to about .5 per 100k in the last 8 years. Civilian + Military deaths, which the other estimates are based off of, have declined in the last few decades, around 200 per 100k at the end of WW2 to about 10 during the Vietnam War era, and now somewhere around 2.
In fact, casualty rates per 100,000 over the last 70 years, have been mostly well above average since the 14th century. The Thirty Years war saw an estimated death rate around equal to WW2. War of Spanish Success about half of that with ~100 per 100k. War of Austrian Succession about 20 per 100k. Napoleonic Wars, about 50 per 100k. Taiping Rebellion - American Civil War 10-20 per 100k. Most of the last 70 years the death rate has hovered at a level well above the historical lows.
Everything before about the early 19th century are based on best guess estimates based on known rates of deaths and casualty rates from the primary source information that did exist, and then extrapolated on a larger scale. So it's not perfect by any means, at the very least, you should be considering that the last 70 years hasn't been some golden age of humanity regarding war deaths. It's been largely in line with any period without major conflicts throughout the last 600 odd years.
https://ourworldindata.org/war-and-peace
What you will see is, it isn't the last 70 years. It's the last 20-25 years where things have really cooled off, but they are trending up again.
