Civilization is learned, not genetically gifted to newborns. All it took was for an entire generation to completely fail to take up the mantle of modernity, learn something of the dangerous past, and then assume the hard tasks that come with being civilized -- oh, such as self restraint -- and here we are: abject ignorance, therefore Trump, and soon, global fisticuffs.
An apex predator species lacking a satiation response, possessing a wild imagination, limitless appetite, and unleashed from all restraint... what could go wrong? Libertarians assure us that, unlike any time in recorded history, strongmen facing no rules or limits will be, gosh, enlightened and fair. This they have read in weighty books... none of them history, all of them fiction.
Delusional apex predators. In possession of nukes. Righteous Christians. Lookout.