> But how do you conceive it's not more widely accepted?
because 99% of people are literally fucking retarded and can't see something even when they're looking right at it unless they're told that its there.
and if you try to tell them that it's there, most of them will ask you for studies that prove that it's there and/or mention something 'scientific that they head' that proves it could not possibly be there.
>do you think it could be valuable as a research subject?
the only thing that determines if something is valuable as a research subject is how much grants, funding, and possible patent money you can make off of it.
everyone that isn't a retard already knows these things and so your job is to convince retards to give you money, which has nothing to do with whether or not it's valuable, but more to do with memes and manipulation.
>Why do we restrain from thinking that if a man looks dangerous, or looks dumb, he actually is?
because people are unwilling to live in a world where things are exactly what they appear to be. and racial differences are exactly as realistic as your ability to realize that someone is a scumbag just by looking at them. black person? he's probably toxic waste and you should avoid him. if he's someone that can behave themselves under certain circumstances, that too will be obvious.
there is very little that is not fucking obvious if you just look.
the entire modern schema of 'truth seeking', 'scientific method', 'rationalism', 'intellectualism' and etc. is actually an endemic flight from reality participated in by a majority of people who consent to collectively confuse each other and to call things the opposite of what they are.
also, don't tell anyone else about this.