25 years ago, with no internet, I used to have several "pen pals:. One of them, a British young man came over to visit. I showed him around the city, and he wanted to go to La Boca. We went to Caminito and explained to him it was not a safe area to be walking around any further. He did not believe it and insisted, I reluctantly agreed and we walked 6-8 blocks from Caminito to some park in the middle of a sunny day, two guys jumped out of nowhere and pointed a gun at him ( he did not have any expensive camera, etc, so I guess his height and skin color got their attention ).
At a gunpoint and now introducing a knife into the scene they wanted his ring ( that he could not remove ) and they were going to try and cut his finger off to take it. I talked them into not doing it, they took all his money, watch, chain, etc, my cash and gave me some change to take a bus. This was one out of two times I was ever a victim of robbery in this city in 43 years ( should have been just one really )
Foreign media more often than not, show Latin America as the wild jungle full of taco eating narcos and corrupt cops. What makes any foreigner in their right mind go and wander around areas outside of touristic circuits is beyond me. I hope this tourist recovers and gets well soon. It is very sad to hear, but some places are just sketchy and dangerous for locals and foreigners alike.
Bottom line is: La Boca should be Caminito, the fair, museums and only on weekends and in day light. Go and leave in a cab or 152 bus, to remain safe.