The psalmist repeats the question to show that he is unhappy with how long Yahweh has allowed the wicked to rejoice. This rhetorical question can be translated as a statement. Alternate translation: "You have waited too long Yahweh; you have waited too long to stop the wicked from rejoicing." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Why the wicked rejoice can be stated clearly. Alternate translation: "will the wicked rejoice because you never punish them for the evil deeds they do" (See: [[rc://en/ta/man/translate/figs-explicit]])