This completely ignores the non-gang members who were detained and not allowed to travel back to their home country (Canada, Germany). Of course that makes quite the world news headline so it's only natural for people to not want to travel to the US anymore.
Then there's the other issue where the PUSA continues to demonize allied countries. Clearly something is wrong. So why bother travelling to the US again?
I have yet to see a story about someone who was detained and not allowed to return to their home country of Canada or Germany who wasn't also either accused of a legitimate crime or otherwise violate the terms of their visa in a clear and obvious fashion. Even in those cases though, you are usually sent back to your home country as the punishment.
It seems reasonable that border control will someday make a mistake, detain someone, and then let them go, but this is rare enough that there aren't any recent instances of it, and it's not an ongoing problem.
Then there's the other issue where the PUSA continues to demonize allied countries. Clearly something is wrong. So why bother travelling to the US again?