You are correct that Seattle has a tremendous amount of homelessness. The rest of your comment doesn't make a whole lot of sense. Sweeps - which you seem to be advocating - do nothing to solve the problem; meanwhile you ironically criticize tent cities in residential neighborhoods without seeming to understand that a tent city
is a residential neighborhood and it is precisely the periodic shutdowns and relocations of tent cities and similar instabilities that exacerbate the homeless problem by blowing folks from place to place.
I wouldn't call Seattle's government "useless", but their effectiveness is certainly diminished by reactionary voters whose moral/punitive emotions get weighed more than evidence-based science on homelessness.