Because an extensive pattern of racism against Black employees is still an extensive pattern of racism. Being an exceptional employer to Asian or White or Middle Eastern employees does not excuse an extensive pattern of racism against Black employees, and vice versa.
Like, I'm not sure how to clarify this further. Being racist against only a specific race or races is very much still racism (sort of by the definition, isn't it).
I don't think it's extensive because of the very low sample size, the fact we don't know about each instance and none of it has been corroborated.
I'm also uneasy about letting black people speak for other POCs on this issue. In my experience, racists tend to be racist towards multiple or all other races rather than a single one -- hence why you dismissing other POCs views on it doesn't make sense to me.
Less than 1% is not "extensive" by anyone's metric, either.
At the risk of repeating myself, it's not 1%. It's 50%.
I don't see back people speaking for other poc. I see black people speaking about their own experiences, and you discounting those experiences because they may not be shared by other poc.
It also seems strange to me that you believe racism is always cross-cultural. The causes of anti-black, anti-middle eastern, and anti-asian discrimination by americans are all different, why do you assume they'd be the same. Things get even more complicated when you add other cultures to the mix. You presumably don't discount caste discrimination against one caste because the others didn't experience it, so why presume that someone who is prejudiced against black people must also be prejudiced against asians?
While there is racism against asian people in tech in the bay, it's usually model minority related things, or language based (or there are other kinds but less common in a workplace context). Less about being unqualified, and more about being different. It wouldn't at all surprise me if the multiracial leadership team of coinbase set the culture such that certain forms of prejudice (that affect the leadership) were not allowed, while certain forms of prejudice (that perhaps the leadership shares, or perhaps they are simply ambivalent about) can fester.