Many many years ago, when systemic discrimination was rampant, A

 (including Chinese Americans or other minority populations) did have their best interest align with blacks, and actually benefited from the black's fight for racial justice.

Now, there is no longer any SYSTEMIC discrimination again the black people (and most other minority groups per se). To the contrary, there is now systemic reverse discrtimination against the whites and often also the asian population in many aspects of our life.  As a result, the well-being of asian Americans is to a greater extent more aligned with the white population.