I agree with your synopsis. I would add that libertarianism could only possibly work in a completely libertarian society, whereas the U.S. has many socialist aspects. For example, as you pointed out, eliminating taboos against homosexuality has lead to the homosexual agenda being taught to children in schools. That’s because our school system is government-run. And, because there are laws limiting free speech, the liberty of those who criticize “sexual orientation” are trounced now.
Another example of libertarian policy would be open borders where people can migrate to the U.S. without restriction. Well, that doesn’t work well when we have so many government programs doling out free goodies. People move here not to be free, but to receive freebies which taxpayers are forced to fund. Plus, we are involved in war, and open borders allow our enemies to come here freely.
Libertarianism is really a utopian vision. In principle, I believe in it, and my guess is that many conservatives do simply because we believe in the laissez faire form of government. But, in adopting libertarian policies here and there, without adopting the whole package, we only end up upholding the liberties of some people while crushing the liberties of others, just as you pointed out.
Your whole post was very well said. But this point says it in a nut shell.