Personally speaking, recognizing that racism is one of many ways to oppress the underclass and then deciding that the issue of racism can be ignored appears to be a self-defeating proposition. As long as society remains divided, there can be no hope for solidarity needed to defend progress made from the forces of reaction. This necessitates an anti-racist stance, as submitting to its continued existence only causes further division that weaken solidarity and reform resolve.
Considering BLM appears to have done more to weaken police power—another arm of capitalist oppression—in a course of three months than the DSA or whatever in anything for the past three decades I know which way I should be standing for leftist solidarity too.
That does have to be considered. Old Left is Old Left for a reason, I guess.