It is very strange, indeed. I’ve never witnessed anything like it. But, the simple fact that what one might call ‘both sides’ had the same reaction immediately after the shooting (scrub or preserve SM posts) is telling. You are 100% correct that this is not the normal, healthy reaction of a victim’s family or people who know/know of the victim.
It has become apparent that this victim was notorious and, sadly, it appears, widely despised for a long time, across many states, among a wide range of people, and had left a trail of destruction, arrests, law suits, and scorching on-line and IRL flame wars in her wake. The outrageous behaviour, some of which is discussed above, FAR preceded this incident.
You are half right in this observation. What you are missing is that people close to her had the exact same impulse. If an average person is shot, the family scrubbing social media and people trying to preserve it, doesn’t ever happen. The very fact that that activity was one of the first things that both ‘sides’ -her family/friends/supporters and her detractors/victims - thought to do while she fought for life in a hospital is, frankly, chilling.
And I find it really sad. It’s sad that that is/was true for everyone on whom this incident had an impact. I genuinely feel that way. If something like this happened to me and that was everyone’s big takeaway from my life thus far, I would be gutted.