If what you're saying is true, then the argument that this is inappropriate to democratic societies is also undermined: what rights the people have are entirely determined by what their democratically-elected overlords grant them. The state has determined that this is appropriate; therefore, it is appropriate.
No, in democratic societies you have the rule of law. This usually blocks incumbents from changing the rules as they wish. Yes of course natural rights don't really exist, but legal rights enforcing some of them are about as real as money.
