Prefatory note: The following "facts" are so oversimplified that they're not really facts unless they are further defined very narrowly. I'll demonstrate that below.
I'd argue that we're genetically predisposed to tribalism, which actually has nothing to do with racism, but that Melanin does indeed make it simple to define a "tribe." Counter-example: the late 60's had large numbers of multi-colored/multi-cultural tribes tied together by a number of colliding cultural norms.
Fact #1} Everyone is Racist.
Now the fact of the matter is that humans are learning not to be racist. Oddly this is not because racism is considered immoral (in fact religious sources of morality are forces in society that actually promote racism through emphasis on tribalism!), but because it is recognized that it is more efficient for society to recognize that cultural differences are a bigger obstacle to cooperation than race is. It's simply a matter of survival to discount the measurably smaller importance of race in dealing with societal problems.
Well, different has to be defined, and you don't do any here. But I'll note that there are tremendous cultural differences among people who are all of a nice Northern European white shade.
Fact #2} The Different Races are Different. It is not a simple matter of Melanin.
Now the fact is that there are some differences between races, and racial intermixing (which has become far more acceptable) is heading in the direction of reducing those differences, but the differences are pretty minor compared to our social and societal tribal differences.
So the question is, yah, but so what?
There has indeed been some resistance to such studies, but the fact is that since demographic information is almost always gathered (especially with medical/psychological but also increasingly with social studies), the data is getting easy to get to, and there is a lot of it going on.
Meanwhile it is Politikally Inkorrect to seek funding to examine possible inherent differences, since the Party Line is that there are none.
The only place this becomes a problem is that when people who actually are actively promoting racism start to use it in misleading ways to show correlations that are really tied to other causes, we end up with cultural debates that are tribally selfish and harm society.
In this thread we see a great example of this in the desire by some like the fellow in the video in the OP trying to tie race to violence, when the clearer cause is a combination of poverty, availability of weapons and a decline in tribal resistance to social suicide.
Fact #3} While I believe that a Black Person is different from me—at least as different as a Bulldog and a Grayhound...I Like Black People.
However, I have a distinct preference for Black Women. I go to a Black Church and most of my Friends are Black.
Good for you! You should! It's good for society!
And I know from experience that Bulldogs and Greyhounds have no cultural resistance to getting it on and producing Bullhounds and Greydogs. We should follow their excellent cultural example!
Fact #4} Yes, eventual complete Amalgamation of the two races via Miscegenation is a very real possibility.
We have evolved way beyond "individualism" and are social creatures. The move back to "YOYO" Libertarian-Anarchy is a gigantic evolutionary step backward. So amazing that you find folks like the Paul's (Ron, Rand, and Ryan) so actively promoting it as a political strategy.
It is a shame, but I see no solution that respects our independence as Individuals.
Now as to the Second Amendment and all:
If I were asked to be the Advocate for The Human Race's Worthiness to Exist...In front of some sort of God-Like Jury, like in some SF or Phantasy Story...I would exhibit some of Smith and Wesson's revolvers made before the cutbacks in quality that started in the '80s. I'd have Colt Peacemakers, Pythons and Diamond Backs—as well as 70 Series 1911A1s...And like Howard Roark in "The Fountainhead" I'd simply say: "The Defense Rests."
We watched Star Trek:TNG "Encounter at Farpoint" last night (<LeonardPinthGarnell>Delightfully Bad!</LeonardPinthGarnell>), which of course has this "worthiness to exist" as it's theme, and as incoherent as you are here, your confusion is actually the thing we need to deal with as a society: If we do not move forward and further develop our society to resist the forces of tribalism and anarchy and selfishness, yah, we probably aren't worthy.
One of the nastiest things about Ayn Randian Libertarianism is that it divides and destroys society by promoting not only tribalism (John Galt), but of anarchic individualism (Howard Roark).
I do just fine disdaining the evolutionarily backward urges of both and condemning those who promote them as examples of virtue.
I'm also for background checks to keep firearms from folks with mental illnesses and felons including those who advocate armed revolution.
It does not require a majority to prevail, but rather an irate, tireless minority keen to set brush fires in people's minds,