I agree, but, to be fair, we should point out that many "l"ibertarians believe our border should be protected, while many "L"ibertarians believe in open borders. The official position of the LP is "free and open immigration." Personally, I think limiting immigration plays a big part in national security.
This "l"ibertarian is against open immigration with the way the country is run now. I think if you ask most "l"ibertarians or "L"ibertarians, most will agree that they would be for some sort of "open immigration" ONLY after the welfare system and all other socialistic systems are totally dismantled and made a thing of the past. Obviously, open immigration would not work in any way, shape or form as long as we have socialism in place.
If there were no free handouts, then only those who wish to work and make something of themselves would come here. Oh, at first, the leaches may try, but when they found out there was no free ride and they would be promptly deported or imprisoned for crimes, they wouldn't come, or would change their attitudes.