My sense is that people mostly just don't want to hear or think about the sometimes messy way that things got to be the way they are (I saw "-2 points" when discussing this a few months ago, https://news.ycombinator.com/item?id=19626519 ).

This isn't unique to tech startups. I live in Massachusetts and do not regularly think about what exactly happened to the Massachusett people. It was not great.