The world was a far more dangerous place when you were born. Death tolls from wars in the 1970s and 1980s were 4–5 times higher than they are today. We are, despite reports of religious and political insurgencies, despite high-profile terrorist killings and unrest in various corners of the globe, living in the most peaceful era of our species’ existence. The world is getting less violent; we’re just more aware of the violence that happens, thanks to the mass availability of information. And unfortunately, the media and our politicians use that information to make it look as though we’re doing worse than we actually are. I’ve written about that elsewhere, so I won’t get into it into much detail. Suffice to say we have some evolutionary hangovers that leave us ill equipped to think about this stuff properly.