Read the memo. It's quite the opposite. The person who spoke up complained about how the protests the killing of an unarmed black man would impact traffic, and found the protests 'ridiculous'. Everybody else nodded.

This caused the black team member to feel unsafe and made him afraid to speak up or even mention that he was going to join the protests.

I wonder what special catering you think the black guy received in this situation.

Let's say you're an HR in this situation. What would you do?

Figure out a way to fix the culture so minorities can feel safe and others learn to be more aware of such issues.

They were not being PC:

Over the last 5 years, I’ve heard co-workers spew hateful words about immigrants, boast unabashedly about gentrifying neighborhoods, mockingly imitate people who speak different languages, reject candidates of color without evidence because of “fit,” and so much more.

Specific examples would help. I'm genuinely curious what those "hateful words" were.

Is the actual situation described in the memo, where people consider their own ability to move through traffic more important than the life of a black man, not enough?

I find it hard to believe someone on this forum would have no clue what 'hateful words' sound like. Even if you've lived a completely sheltered life, at least you can read. Inform yourself.

No, it's not enough. He made a few very specific and strong statements that need to be backed up with something.

It's a memo, not a lawsuit. He's describing a harmful culture, not naming specific names. He doesn't have to name specific slurs that were used. I would really like to believe that you're smart enough to understand what some of those slurs could have been. Which exactly were used has no relevance to the message of the memo.

Without details this memo isn't credible. Just like he doesn't have to mention any details, we don't have to believe him.

Do you work at Google? People at the company may well recognise the situation. Whether or not you believe it is relatively irrelevant. Anyone with any social awareness will recognise this as something that certainly could happen. And people who are set to disbelieve it no matter what, will not be swayed by evidence anyway, like creationists and flat earthers.

So white people are afraid of being fired for something they chose to say, vs black people afraid of getting killed by the police for fitting a description?

Yup, you've nailed it.