Caravans

[Amarok]

El Salvador and Honduras aren't Tyrannical governments. 

No their governments too weak to protect their people from the tyranny of the criminal elements that are integrated into them .

They are basically non-functioning states. The people traveling north are escaping poverty by and large. 

Nope their escaping the government  who can't protect them from criminal elements overrunning their state and directly integrated into said government  

Otherwise they'd just go to another country in central America, not the US.

Their clearly going to go for an optimal country in terms of safety etc

They a refugees end of story