They are flooding here en masse because propaganda is circulating where they live that if they can just get across the border they'll be allowed to stay forever.
And you can be certain of this how? Because someone on Fox News told you so? Do you have some kind of first-hand knowledge? Who is responsible for that "propaganda"?
"Honduras has the world's highest homicide rate for a nation not at war. In El Salvador, the end of a truce between street gangs has led to a sharp rise in homicides. Violence spread in recent decades after members of California street gangs were deported to Honduras, Guatemala and El Salvador, where they overwhelmed weak and corrupt police forces."
The UN is close to declaring these children refugees (unless the US government bullies them out of it). How much harm can 50,000 children do to a country of 300,000,000 people?