Let me stop you there. ANY right can be "taken away" in the sense that a person can be deprived of it. The issue, though, is whether someone who isn't the grantor of the right can "take it away" in the ethical or legal sense. In the case of natural rights, we're talking about a moral or ethical state of affairs. Perhaps you don't believe in morality; you just assume that life exists and there's no point to it. Whatever rights you get come only from a beneficial human. If that's the case, then our discussion is over, because no amount of moral proselytizing on my part will sway you. But from a legal standpoint if the state says, for example, that you have a right to be repaid for a debt and I just say, "Screw it. I'm not repaying you," according to your logic your right to repayment ends there. I mean, if you're going to argue that someone other than the grantor of a right can "take it away" then, well, I just took your right away.