Everyone who passed is guilty of murder.
What happened to "judge not, so you shall not be judged likewise?"
I think it's fine to say they should have stopped. But they didn't kill him. He probably would have died any way.
There are some here, including me, who feel there is a duty to stop and be with him, even if he's just fading away. He killed himself, with a lifetime of arrogant decisions that led him there.