There is an article here about a conversation with renowned San Diego photographer Randy Dible.
He was the one who told Callum about his favourite surf spot in Baja ... which is La Bocano, where the men were killed.
Callum had been asking about good spots for camping and surfing on their trip.
Randy Dible even took out a paper napkin and drew a crude map for Callum to show how to get there. It is off the highway, 10 miles/17km down a dirt track in a valley, the only way in and out.
He says he feels wracked with guilt, he wishes he'd never met up with Callum that day (the day he told Callum about the spot).
But he had never had trouble there, and he knows the area like the back of his hand. Explains how the killers drove 5 miles/8km south to dump the men, then drove back to another spot to burn their vehicle.
US photographer Randy Dible’s guilt over death of Australian brothers Jake and Callum Robinson
(paywalled for some)