[Mrs. Don-o]

The purpose of the symbolic enclosure is not to keep gentiles out, or to create a no-go zone. According to the article, it's to create a kind of "virtual" boundary within which you'd have a single kind of ritual space. These eruvim posts and fishing lines are barely visible or noticeable. They are the next best thing to invisible fences without being literally invisible.

Correct me if I'm wrong, but I don't see why anyone should be bent out of shape by this. I mean, it's not my religion, but it's no skin off my nose, either.

It's also not my job to decide whether this is within or outside of proper Jewish fidelity to their religious customs. There's no way I, a Christian Gentile, have any reasonable way to have an opinion on that.

[SJackson]

Correct me if I'm wrong, but I don't see why anyone should be bent out of shape by this. I mean, it's not my religion, but it's no skin off my nose, either.

You're not wrong. I put a couple links in post 18 explaining the concept.