I think it’s a trauma-avoidance mechanism. If someone doesn’t register a major event, and can just continue living their known pattern, there’s something (biologically) good in that, when the other option is to disrupt the pattern you use to survive.

Now that survival isn’t by-and-large the issue, and we have the capacity to register and process things of great magnitude, some of us can and do. But, it’s up to those who do to create an actionable course, if they want others involved. It’s just not enough to shout and make sure people know - there must be an actionable course for it to truly register.

It can be hard to watch that apathy, though.