Name a single case of a parent being prosecuted for negligence, or even having their children taken away by the state for the dangers endured in the Darien Gap. They are treated like kid gloves compared to how a US parent is treated if they exposed their children to such risks in moving. No one is claiming the US didn't fuck up South/Central America, your point there is a red herring (US also spent hundreds of years stealing from its own poor too, and especially the slaves who might be the ancestors of those looking to move, so join the club).

It's not that they haven't suffered risks and dangers and "500 years" of historical grudges. It's that the main risk a broke American parent has of moving their children while broke is that they're going to run afoul of negligence and abuse laws of the US that don't allow you to live in the rough while hopping freight trains or however broke people are crossing the continent. If your kids get ripped away in a river you are going to jail, if you're caught living in tents in the forest or desert then child services is going to be contacted. Immigrants get to bypass this on the way to the US -- if their children dies in a river in the Darien it either gets ignored by greater society or written in a news blurb about how brave and unfortunate they were (maybe alongside your sad story about NAFTA -- your sob story narrative makes my point). This means they can actually move while broke and they might actually be able to get away with it in the eyes of the state.