God has set rulers in seats of authority to be a terror to evil-doers. Let these rulers devote their efforts to overcoming their enemies, not look for rebellious Christians to prosecute. There are rulers who themselves are evil and allied with evil men. Nevertheless, Paul says to obey. The goal of governments is to defend social order.
Every government has rules.
It enforces standards with sanctions. Most civil rulers want more authority for themselves. They want things to run smoothly. God has built into human nature the desire to live in a predictable world. For predictability, there must be rules and sanctions.