Well, the article in Hawaii said that those were 'voluntary'.   Their participation has all the 'voluntary' nature as those in Eugene who were moved out of several city owned properties over the last few years.

In Hawaii in recent years they have been aggressively moving them out of tourist areas using 'sweeps'.  

"Honolulu city crews on Thursday began clearing the final section of one of the nation's largest homeless encampments, once home to hundreds of people.

City officials said about 100 remaining homeless people would be affected by the two-day sweeps in a neighborhood of expensive high rises near the center of Waikiki, just steps from the Pacific Ocean.

But others thought that estimate was low. Beatriz Cantelmo, a deputy ambassador with the U.N. World Human Facility, said she counted 278 people still living in the encampment Wednesday, less than 24 hours before crews were set to start clearing them out."