I don't think that a genre can be evil. Although, songs and performances that encourage risky and immoral behavior should not be listened to.
Music either makes me think or makes me feel, sometimes both (which is the best kind).
Most anything by Mozart makes me thankful to God, for his talent was extraordinary. Same goes when I listen to Pavarotti, the then six-year old Connie (at Britain's Got Talent two years ago), and Alison Kraus.
Then you have songs/compositions that combine musical genius with special meaning, like Rachmaninoff's Great Vespers, Verdi's "Dies Irae, and "Whiskey Lulluby" sung by Brad Paisley and Alison Kraus.
Finally, who cannot be enchanted by many of the standards in the Great American Songbook and even some of the newer standards from newer musicals?
With standards this high, rock comes into better focus and context. The best rock combines musicality with artistry, ergo: The Eagles!!!