I don’t know, there’s been some loopy monarchs as well like this lot
https://www.therichest.com/shocking/15-of-the-most-evil-monarchs-in-history/
I think the saying about power corrupts and absolute power corrupts absolutely is probably right our monarchy has relatively little power these days so they have a limited influence where as some of the historical ones that had absolute power we’re pretty awful I’d also say that a lot of bad shit has been carried out in the name of various Gods the fact that those republics were atheistic was purely because the dictator or state was to be seen as the highest power,I think without checks and balances any authority be it a dictatorship a monarchy,a democracy or church can and do get out of control given half a chance it’s not so much the system at fault although some systems are terrible it’s the people and the culture they grow up in that shapes them some folk are just cunts