Washington State Constitution, Article I, Section I: All political power is inherent in the people, and governments derive their just powers from the consent of the governed...
Elected officials do not become Royalty or omniscient with their election. The people must have some avenue of redress should such officials mistake the will of the people. The right of Initiative and Referendum is such an avenue.
Good grief, why would any group of citizens NOT want that right. Infact, I was not aware we had to ask/vote for that right! I thought all WA state citizens have that option. Doesn't mean we have to exercise it every day, but we are a self governing country (to the best of our ability these days, anyway) and should never forfeit that privilege or squander it.