There's more to it than welfare. Even without a welfare state, unlimited immigration would still drive down wages - thus destroying the wealth of the nation.
What many Libertarians don't realize is that we already have open borders - between the states within our country. If the standard of living in Mexico was closer to ours (as it is in Canada), then an open border there would not be as big an issue (as it is not with Canada). But even then, security requirements in the modern reality require guarded borders.
The article does a good job of stating my own opinions, as far as it goes. I would like to be a Libertarian, but they won't let me.
That is because you are not a Libertarian. Don't let LP con men tell you differently. We Libertarians have a few things in common with political conservatives, but as Libertarians we are not politically conservative.
Personally I'm quite conservative. But when I present my Libertarian views, I am definitely not conservative.
Twentyfive years ago, the LP would have kicked out half the conservative members it now holds in high esteem. Now it attempts to quietly jump past its anti-conservative agenda. This passive form of dishonesty is not going to last. The LP will either become a conservative compromising spoiler in American politics, or it will return to its principles and thereby reinvigorate it greatest potential, that is to carry the message of economic freedom to those who other wise will not listen. If in the process, the movement grows so as to make make the LP a truly major political party, fine. If not, so what? As the LP will have successfully accomplished something great for America regardless.