You can translate this in a positive form. Alternate translation: "he carries the sword for a very good reason" or "he has the power to punish people, and he will punish people" (See: [[rc://en/ta/man/translate/figs-litotes]])
Here "wrath" represents the punishment people receive when they do evil deeds. Alternate translation: "a person who punishes, on God's behalf, those who do evil" (See: [[rc://en/ta/man/translate/figs-metonymy]])