UNPOPULAR OPINION: Velma did nothing wrong.

UNPOPULAR OPINION: Shaggy did nothing wrong.

UNPOPULAR OPINION: Fred did nothing wrong.

UNPOPULAR OPINION: Scooby did nothing wrong.

UNPOPULAR OPINION: Daphne did nothing wrong.

My reasoning? If you watch the show carefully, you will see that the mystery gang love solving mysteries and helping people, and they don't do anything bad during the episodes. It could be argued that they are the protagonists of the show.