Government, while necessary, is inherently dangerous and must be guarded with vigilance and skepticism by those from whose consent its authority is derived. It's best kept to the bare minimum of authority and scope required to perform its functions.
The legitimate functions of government are threefold:
1. Secure the borders.
2. Provide a domestic justice system.
3. Practice diplomacy.
Providing for a currency might be a fourth function, but it's debatable. All else is tyranny.