The LBJ engineered assassination of JFK the year before plus that murder marked a transition of America . . . and not in a good way.
A famous Mass Democrat once said “we discourage self help”...
But what are the chances that IF somebody DID intervene?
It is likely that the perp would be out of custody and at the intervenors house before that person finished giving their statement to the police?
I remember reading about that at the time.
The murder of Kitty Genovese is a bad example. The media sold the lie, in order to cover for government negligence, that no one did anything. Multiple people did in fact call the police.