It somewhat is disturbing to think anyone would actually make the argument that the borders are what is preventing Chicago gun control policy from actually reducing the murder rate. It's just...stunningly insanely stupid.
This is a strawman. Eskimospy and I are not making the argument that a lack of borders is the
only reason that Chicago's gun control doesn't work. We're making the argument that it is
part of why it doesn't work, and that it is invalid to generalize from a ban that includes no borders to say that because it doesn't work, that this proves a ban WITH borders also doesn't work.
Let's try it a different way.
Suppose the earth has only two continents, called AB and YZ, each of which has two countries. AB is split between A and B, and YZ between Y and Z. There is no way for goods to move between the two continents.
A has strict gun control laws, but B has none. There is a border between A and B, enforced at the same level as the US-Mexico border.
On the other continent, Y has strict gun control laws like A's and Z has none, like B. But there's no border between Y and Z -- people and goods can flow freely between them.
Now, the simple question: which country will have more guns in it, A or Y? Answering that with anything other than "Y" would be, in your words, "stunningly insanely stupid".
And anyone who can't understand this simple analogy needs to go back to high school for remedial logic classes.
As an aside, I find it absolutely hilarious to see a bunch of right-wingers using "borders don't matter!" arguments. Aren't you the same folks that want to build a wall along the Rio Grande and deploy troops along all of our borders? Why bother if "borders don't matter"?
Gee, maybe it's because the truth is that borders are imperfect but do make a difference? Which is
exactly the point that eskimospy was making: borders don't stop all gun flow, but they stop it a lot more than no borders, so saying that because Chicago's gun ban doesn't work that a nationwide one wouldn't work is "stunningly insanely stupid". There are valid arguments against nationwide gun bans, but "look at Chicago!" is not one of them.