Occasionally, it seemed maybe once per year, they would actually get a task force to go sweep it out. But that was mostly only in response to outrage from residents of the adjacent Beacon Hill neighborhood. And then they would go back to ignoring it. And a month later the whole camp was back.
This is just one anecdotal example of Seattle's long history of indifference, even tolerance, of "shanty towns" and homeless camps. I don't know how it is now, but King County in general used to be littered with these things and people just seemed to think it was normal.
It is absolutely _not_ normal.
The Seattle Police Department is woefully understaffed and has given up on responding to many quality of life and public order calls. In addition to drug use, car prowls, etc there is a thriving shoplifting-fencing business going on in spots throughout downtown. Enforcement has been very limited, so the problem has gotten out of hand. I have no clue why the Target near Pike Place remains open - they must be locked in their lease.