The problem isn't that "Silicon Valley doesn't care about black people," it's that those issues they do take a stance on have a clear, prevailing opinion inside the community they're attempting to reach -- and they can use that to make money.

The black community is not monolithic, and the opinions expressed by this man w/r/t police brutality do not encompass the views of everyone these companies might want to reach. Therefore, it's not a solid money-making proposition to take a stance on this issue.

A more appropriate assessment might be, "Silicon Valley only cares about itself and the interests of black police brutality victims don't intersect with that."

Polemical headlines doesn't make an argument more persuasive; Silicon Valley companies don't have a say in police use-of-force, but the author knows and is only trying to tie the two topics together for popularity points.