Over educated idiots can do much more damage. At the other end of the scale the worst they can do is “Hey, y’all watch me do this!”
This is why in the Stupid Scale I sorta pulled together some years back (inspired in part by the Richter Scale) the low end Stupid is limited to the mid range no matter how dumb it is because it is limited in the harm it can do. By contrast the high-spec Stupid from bad ideology can harm ever an increasing scale of people and stuff, till at the mid 8’s it’s basically tapped out for any civilization that cannot physically do worse than destroy their own world.
Class 9 Stupid could bring down a small interstellar polity all the way up to a galactic one. Class 10 Stupid can even endanger all of existence.
When I first came up with the rudiments of this idea it was in a humorous post where a captain of a starship approaching Earth was reacting with horror and disbelief because his science officer had just announced detecting a Class 8.6 Stupid.
“Impossible!” the Captain blurted, “The planed of Hey Watch Me Do This is the dumbest place in the known universe and it only ever gets to the mid 7s!”