Psalm 34:21 New English Translation

²¹Evil people self-destruct;^[a]
those who hate the godly are punished.^[b]

Psalm 34:21 tn Heb “evil kills the wicked [one].” The singular form is representative; the typical evil person is envisioned. The Hebrew imperfect verbal form draws attention to the typical nature of the action.
Psalm 34:21 tn Heb “are guilty,” but the verb is sometimes used metonymically with the meaning “to suffer the consequences of guilt,” the effect being substituted for the cause.

New English Translation (NET)