“Children are fleeing violence.”
Not “Children are fleeing Hondurans, Guatemalans and El Salvadorians”

The individual is fleeing a concept, and not other people.

The reasons why are fairly obvious, because if you personalize the object being fled from, then this raises awkward questions.

For example, if these Hondurans, Guatemalans and El Salvadorians are fleeing other Hondurans, Guatemalans and El Salvadorians then what does this suggest of Hondurans, Guatemalans and El Salvadorians in general?

Why does a country full of Hondurans, Guatemalans and El Salvadorians become hyper violent? What is the magic system that turns them into model citizens when they cross the border into the USA, as opposed to reverting to the violent mean?