Amish Anabaptist regard the New Testament alone as authoritative Scripture. The Old Testament does not inform their ethics. There are even parts of the NT which they neglect, i.e. Romans 13.

Because they renounce violence and every form of coercion, they forbid their people from participating in police departments and the military. Hence the Amish cannot really stand for justice against the oppressed. They do not cheer on the civil magistrate as he metes justice upon evil doers. Their extreme form of forgiveness violates Luke 17:2–4

"If your brother sins, rebuke him, and if he repents, forgive him. If he sins against you seven times in a day, and seven times comes back to you and says, 'I repent,' forgive him."

Forgiveness requires repentance.

The Chestnut Mare