Perhaps there is a corner case argument that everyone with a great deal of personal power who wants control over the world and will leverage their power to get it is criminally insane... but human history is FULL of this stuff.
As for Faerun - as an ex-archaeologist and student of anthropology and ancient history, I can tell you that it makes little sense as a world and the conveyor belt of world-ending problems it suffers without anything really changing underlines this - spellplague aside (which was undone because the default status quo has too much weight). It is a kitchen sink hodgepotch, and I don't think it every claimed to be anything else. It was developed as a place to tell children's stories at first, and it shows.
Greyhawk makes much more sense, as does Dark Sun, Krynn and Eberron etc. They are the products of worldbuilders, not 'I need somewhere, anywhere to host adventures' storytellers...
Another point about the conveyor belt of disasters... anywhere prone to tornado probles have fairly standard tornado shelters. Florida backyards are dotted with little pointless nuclear fallout shelters dating back to the cuban missile crisis & if korean dramas on netflix are any indication they aren't that out of place there either. Taking that a step further, florida has the miami code a bunch of infrastructure dedicated to shelters & supplies plus a ton of laws that are written to ensure avoidable problems after a big storm don't happen again.. Having dated people who were kids in homestead after andrew(and seen it myself), lived through wilma, worked in the building with the post office across the street from the anthrax building, & so on... FR doesn't even pretend to learn anything from those disasters so often held up as defense for the cultural stasis because it doesn't make the walled cities of Athas with its single apocalyptic troubles & limitations look like some kind of wishy washy half assed red light district of extreme permissiveness.
The whole "I don't need somewhere, anywhere is ok" thing works to a degree, but somewhere along the line FR & planescape became something very specific loaded with very specific& often conflicting plot armor treated as a sacrosanct. 5e is especially bad at elevating FR & planescape specific lore to the point of limiting design & getting reinforced with mechanics. Aside from the eberron stuff nearly every official book dedicated to FR with tasha's going one further by reprinting artificer but with all the eberron stuff replaced by FR & planescape stuff to finally abandon any shed of pretense for them being the "kitchen sink setting" they get held up as while pushing it into dominating basically every aspect of 5e.