> If it was the social and political forces of the French Revolution that made Napoleon successful, the logical conclusion is that it would have made no difference to the course of history should he have, say, suffered a fatal stroke in 1801, a premise few would accept. It is clearly untrue when applied to specific cases. Not only who ends up in power, but the specific decisions they make are deeply consequential. Who would really contend that the 20th century would remain unchanged had Hitler been killed in WWI?

Isn't the idea more that the large-scale political forces are what allow those supposedly "great men" to become "great" in the first place? Yes, once Napoleon was in power, a lot of the details of history were dependent on his individual decisions - but the forces that led to the French Revolution were what gave him that power in the first place. An if he had actually died of a stroke, or if Hitler had been killed in WWI, then the specifics of history would have been different, but probably not the large-scale trajectory: Post-revolutionary France would still have been there and the deep divisions, senses of injustice and reactionary and capitalist influence in post-WWI Germany that gave rise to the Nazi movement would also still have been there. And chances are, other "great men" would have emerged and captured those forces.

As such, I see the relationship more like the one between lightning strikes and wildfires: Yes, a particular wildfire might have been caused by that particular lightning strike (or careless hiker or whatever), but the reason why that particular local event could spiral into a blaze that burns down acres and acres were the larger environmental conditions, i.e. hot weather, wind and dryness. And if firefighters could take a time machine and prevent that particular cause, then it's likely another random event would trigger a slightly different but still extremely similar wildfire - so not much would have been won.