> no one remembers it.

That doesn't resonate with my experience. People know about the murder, but aren't sure what to do.

The murderer, who clearly had mental health issues (eg, having "you're fucked" on the dust cover of his personal AR-15, which he used to commit the act), was acquitted (in a trial of strange circumstances). It's baffling that none of his colleagues - who saw the message on his weapon - ever pulled him aside to ask if he was OK.

And anyway, what does this have to do with your point of holding up an unlikely / outlying example to demonstrate a phenomenon?