User blog comment:Smurf Manian/Gargamel on trial/@comment-4165715-20130221234807

They are a protected species, under the protection of King Gerard at all times since he technically owns the Enchanted Forest in which they live. Plus, the Smurfs allow Gargamel to stay because they can keep an eye on him, so he doesn't cause trouble for anyone besides them. This was learned from the Season 7 episode, "Gargamel's New Job".