> Nobody seems to ask this question about the apparently rampant racism in the US

I can't tell if you're trolling or not, but in case you're not from the US and genuinely confused about this... there are mountains of data on systemic racism precisely because it's one of the biggest questions. Academic journals are full of answers, not to mention endless books.

Even isolated prejudices can lead to systematic issues, so even if it was, it would be a problem.

For example, if key individuals in certain positions hold the prejudices, it can have a systematic effect, since they have a lot of influence on the design of the systems in place and can easily create an unfair distribution of other people in charge/not in charge.

Lol just look at number of people in tech who are black