If every black adult owns a gun, then black Americans would be the most heavily-armed segment of the U.S. population, and given your reasoning they would be armed specifically to engage in racial violence. Given the wide variation in sources of ethnic cleansing and genocide--but often because of some historical grievance, and almost always out of a perceived need for self-protection--shouldn't every other racial group also have all their members own guns to protect themselves against genocide caused by black Americans?

I just don't see how this is a healthy attitude. Individuals should, of course, be able to take reasonable measures to keep themselves safe. And in the U.S. that apparently includes owning guns.

But to buy guns en masse on the pretext of mass racial violence seems to invite the very thing that it claims to wish to avoid.

I have the exact same criticism against non-black people (usually white) who witnessed things like the riots (the actual riots, not the protests) after George Floyd was murdered and use this as an argument that a race war is coming and their group needs to be armed to win the war. No, bristling with weapons while proclaiming the expectation of violent hostilities against other groups is exactly how to get the other groups to also arm and be hostile! People are reactive.