It's an average group IQ issue, AHZ. IQ measurements predict (strongly) success in all of the major life outcomes: educational, occupational, interpersonal, social,health and longivity.
In short, the higher your IQ, the more likely you are to have successful, productive, fulfilling life outcomes.
Measurements of IQ also overlap with levels of (sound) moral reasoning and Executive Functioning (self-control/self discipline, emotional control0 For instance, incarcerated criminals tend to have low IQs, which means they are stupid, have poor moral reasoning and poor self-control; which are the reasons they committed the crime/s that put them in jail.in the first place,
In the Republic of South Afriva, the average IQ is a bit over 70 points (that's low, dude) because the Black African brain has not evolved to the same size/level of sophistication as the White (Western European descended) American's brain has. (The average white American has an IQ of 100 points) That is why South Africa is a filthy dangerous, crime-ridden failed state - the cities there have a low average IQ. Same thing happened to Detroit when its population was 90% Black. From being the economic boom town of "Motor City" in the 1950s, when the city was still largely white and run by white local poiticians. As the Black population of Detroit rose it resulted in "white flight" out of the city. When the city was predominantly Blacksevery form of social pathology set in: poverty; chronic welfare dependence, a widespread drug abuse/addition problem; gang violence, rape/sexual assault,high rates of murder and other violent crime, larceny, crumbling infrastructure due to corrupt Black Mayors and other local politicians, then in 1967 a spectacular race riot that forced LBJ to call in the National guard.
Same in Mexifornia, the majority of the population are Hispanic , including millions of illegal Hispanic immigrant. Average Hispanic IQ-87 point. That's one of the main reasons California is pretty much becoming a thrird world shit-hole (as Trump would say).
Eventually America's Blacks, Lispanics, Latinos ,and other low IQ, coloured 3rd world races will out-populate and then replace the White (European) Americans - and when (not IF) that happens, the US with turn into one giant shit-hole. (What worries me is America's massive nuclear weapon arsenal ?)
Dachshund
DLM....Dachshund Lives Matter !
What percentage of Trumppers believe this?