As much as I hate to agree with a thinker who actually believes that - through some uncorrectable flaw in our God given or evolutionarily produced human nature - mankind is damned to eternally live under the control of the strongest thugs, I have to agree with you on your main point in this posting.
We can talk about unalienable rights all night long but the truth of the matter is that those freedoms which we are allowed to practice are only those that the thugs in control allow us to practice. (We can disobey the thugs, of course, but if we are caught we pay the consequences of their choosing.)
Similarly, we can talk about what the Constitution says all day, but the sad reality is that the Constitution means nothing more or less than what nine robed, government appointed judges say it means.
Where I divert in agreement with you, however, is that unlike you I have no problem with anyone who, in the furtherance of liberty, chooses to use the "rights" argument to convince others to join us. The argument HAS been productive in the past with many, and as far as I'm concerned, anything that gets folks moving in the right direction is okay with me.
Never trouble trouble til trouble troubles you. Fortune Cookie