The terrifying dystopia is already here. Try walking or taking a bus from King Street Station to Third and Virginia in Seattle without seeing human excrement and tarp shelters. The area is completely unusable.
Try eating a sandwich for lunch in Pioneer Square, or in Denny Park.
That I don't feel safe traveling through my own city because it is overrun by mentally unstable people is unacceptable. Neither they nor I should live like this.
We have rules and norms in a civilization. When we ignore real problems like mental health everyone suffers and those norms break down. I am not in favor of adjusting our norms to include "well you can't use public spaces because we don't care about mental health".