Why are the Quileute people werewolves in 'Twilight'?

It turns out Stephanie Meyer's Twilight saga is based on some documented folklore--at least when it comes to werewolves.

in reference to:

"The Quileute Nation has lived on the Olympic Peninsula for thousands of years. Today, the Quileute Tribe is located in La Push, Washi., on the shores of the Pacific Ocean. La Push is not far from Forks, Wash., where the "Twilight" series takes place. Author Stephanie Myers references Quileute folklore in her decision to create Quileute characters in her story that transform into werewolves. The actual "origin" story of the Quileute people, as documented in "Quileute Religion: What the Old People Believed," prepared by the Quileute Tribal School in 1989, reads: "There was a kixi' (elder/knowledge carrier) that tells how k'w a'-ti (the transformer) was on First Beach when the wolves came down to run on the beach. The k'w a'-ti often had trouble with the strong and fierce wolves. So the transformer decided to be free from the wolf problem once and for all. He transformed the pack of wolves into the Kwo' li' yot, the people who live at the village, which came to be called La Push. …That is how the Quileutes of La Push came to be.""
- Why are the Quileute people werewolves in 'Twilight?' (view on Google Sidewiki)