Government effective authority does not come from accepting its role as arbiter of morality, but it comes from people belief in the system of laws and government, beliefs about who is or should be given superior powers, like tools of mind control (schools,media) and matter control (police,army).
Of course one can think of oneself as being outside the power of government, and that is very powerful. Then some principles such as human rights are naturally seen as inalienable and independent of what any government says/legislates/enforces. Such independence of thinking and actions from the government is sometimes a highly moral position, like when people in Europe helped hide and save Jews from Gestapo.
But morality is not universal, people have different views, and the government and its tools are still there, they can threaten and hurt people. So many will usually choose to comply with the government restricted version of human rights, as long as it's bearable.
Of course one can think of oneself as being outside the power of government, and that is very powerful. Then some principles such as human rights are naturally seen as inalienable and independent of what any government says/legislates/enforces. Such independence of thinking and actions from the government is sometimes a highly moral position, like when people in Europe helped hide and save Jews from Gestapo.
But morality is not universal, people have different views, and the government and its tools are still there, they can threaten and hurt people. So many will usually choose to comply with the government restricted version of human rights, as long as it's bearable.