Thank you for supporting anti-racism by disproving your own premise in this one sentence.

The fact that the event you describe was an extremely unusual (i.e. in your words, bizarre) occurrence indicates that this sadistic murder was not the product of systems of oppression, but simply the aberrant behavior of one depraved individual. Perhaps you might bone up on what systemic racism is before you attempt to take one isolated incident as evidence that it doesn’t exist.