Murder Rank Ideas

I wonder if there's been a single year in the history of our species where a person hasn't taken the life of another. It would have to have been a year when there weren't many of us around. I hope we can get another such year soon! 2024 is already out, so it'll have to be 2025.
In the meantime, is the idea of murder useful in our quest for good life? 
Only time will tell. Time, and this episode of your favourite podcast, Rank Ideas!