most people misunderstand what IQ tests actually determine

they are a measure of creative problem solving ability. the ability to determine correct solutions to problems that require complex chains of reasoning and intuition to make the link between superficially disconnected pieces of information.

this is most definitely a concrete ability that varies among people. there is a big distinction between "thinking you are smart" which people call "mid" and knowing you are dumb which people call "retarded" and actually being very good at understanding the patterns hidden in information.

mids often think they are smart, and have excessive confidence in their ability to reason, but they cannot do actual problem solving, they just recite the few formulas they have high confidence in, this is common among those who score 100-120, but people who are 130-150 (which is the actual top 5% to 1%) tend to be more uncertain about their ability to reason because they are so good at guessing they can often skip the systematic reasoning.

and it has absolutely nothing to do with personality or ethics. there are completely evil people with top percentile IQs. Peter Thiel, Elon Musk, are examples. Donald Trump is a top 5% or so, and has boundless self confidence that makes up for the deficit. really he's almost a mid, but he's smarter than a mid.