You know, it seems to me that the Libertarian Party (such as it is) has been totally hijacked by some Cheap Labor Express Group. I remember reading their official platform a couple of years ago and found little in it I disagreed with.
However, looking at it a couple of days ago, it seemed to me that it had been almost completely rewritten and bore little resemblance to what I remembered, and in particular, the STRONG implied support for illegal immigration and globalism was shocking and definitely something not there two years ago.
I was operating under the same assumptions you were. I attended a lecture by a Libertarian candidate explaining things a few years ago. I got the impression, back then, that Libertarian principles were dependent on a stable, responsible population that doesn’t depend on government or a lot of supervision.
There's nothing in what I read that favors the US being over-run by people who undermine the US. If you read it, I'd be interested in your impression. I thought the policy made sense and that it's nothing like what Johnson and Weld are saying.