Europe at War

One demagogue psychopath rising to power can always do this. And will.

The Steven Pinkers of the world who see an irreversible moral shift away from violence and toward our "better angels" may be correct. But that's a shift of the median, while there will always be edge cases forcing themselves into power - on the backs of a dumb, aggrieved mob, ripe (per Eric Hoffer's "The True Believer") for manipulation.