It seems to me that political libertarianism is a separate thing from libertarianism. There is obviously a lot of overlap, and there's a load of friction where that overlap occurs. Friction can be good or bad-- it can wear away rough spots that need to be removed. But the friction in this case seems mostly destructive.
What do I mean by "political libertarianism"? Political libertarianism is concerned with pragmatism, politics, government, v*ting, the LP (and party politics in general), and not "scaring the women and children" with harsh truths. It seems to hate something external to itself more than it loves liberty.
I've watched political libertarianism used to justify police, "borders", war, taxation, and many other statist problems.
I think all libertarians slip into political libertarianism sometimes-- it has happened to me-- but some choose to wallow in it. I don't think anything beyond a quick dip is healthy-- and I'm not sure how healthy even the quickest splash really is.