When is it ok to wall in your citizens?

[hollodero]

I'm certainly not a fan of any border wall, but this is comparing apples to origins. The German wall wasn't used to keep Eastern Germans out, but to keep Eastern Germans in. It was built by the East, not by the West. (if it were built by the West to keep Eastern Germans out, or if it were bulilt by the East to keep Western Germans out, then that would be valid equivalents to Trump's wall; but nope.)