Well, I don't know what white men feel watching those pics and videos, but I do find important cultural differences among Western countries. Many progressive Americans find IR sex much more disturbing than they are able to admit.
There is something really primal in these pictures, because the black men are the epitome of the otherness for white men and, although now we have dissociated sex from reproduction, for centuries the sexual possession of the women of other peoples has considered the ultimate symbol of conquest. In the book Against Our Will, Susan Brownmiller studied the ******* as a war tool to submit enemy populations. When men of an ethnic group see with impotence how "their" women are taken by foreigners, they feel castrated. All their pride collapses.
Of course, there something really hypnotic in watching a big, dark cock penetrating a pink pussy (especially when it is your pussy).