Originally Posted by Paul Markham

Why did Obama get praised for building fences along the border and Trump gets vilified for trying to build a wall where people are walking across?

Either both are wrong or both are right. They both cost similar to build and maintain, both require extra measures, neither will stop over stayers, one is easier to climb that the other, both can be tunnelled under, etc.

Yet one is right and the other wrong. And I can't explain why, can someone else? Please.