Aitch. Normally I adore you. But I think today you are conflating vastly different things.
IMO:
Expressing grief (even if overwrought and self-indulgent) a v important social steam-letting.
People do, frequently, feel hugely over-identified with the tragedy of others. That is how art/ lit (eg Shakespeare) works.
I am one who asserts that horror is endemic in our society - that our 'nice' neighbours are just as likely to be abusing a child. I often go on about the 'tricks' which exist in our culture to distract us from that fact (eg: look! paedophile/forced marriage/stranger rape)
However, in this instance I do understand that, as a culture, we just need to talk about it. However mundane and banal that conversation is is. It has to be absorbed and contained, if we are to move forward. Eventually, I do hope, we will move forward.
Agree it can distract from demanding actual social change. But the truth is that the public-grief-expressers were never going to be the social-change-demanders.
If you are a social-change-demander, there are many things that you can do, and maybe do already.
Mabana has made many interesting points, I think.