You can always tell which man the monsters will venerate - just look for piles of human bodies piled up to the clouds and meaningless destruction and chaos, a wasteland of blasted earth where there are nothing but crows left and the smell of smoke and devastation.
Ordinary people cannot tell right from wrong. They can't tell good from evil. They can't distinguish truth from lies. They are blank slates upon which is written the will of the psychopaths and abominations who rule over them.
The same things were said about Emperor Nero by his friend when he was gone. Every other wicked man wants to idolise his predecessors even as he himself plots to exceed them all in body counts.
I suspect my ancestors had simple criteria for "good leadership." If they are getting a lot of people killed then they are not good leaders. If they are getting a lot of people killed and not doing any of this fighting themselves, they are not fit to be leaders at all. If Western people insisted on only permitting men in leadership who had themselves been soldiers and known the horrors of war, they could save the lives of their sons and the lives of the people who have done them no harm.