I'm curious where your information came from.
Last year, The Economist listed Seattle the 4th most livable city in the United States, based on 5 broad factors: culture and environment, infrastructure, health care and education. Also on "stability" (2019) which shows the protests are of recent onset and likely related to having a white supremacist and extremely weak leadership in the White House the last 3 1/2 years, a situation soon to be resolved.
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Every major centre has tent cities. They're in specific areas and police correctly try to not create a larger problem by moving them.