The U.S. Supreme Court’s watershed decision on homelessness Friday will make it easier for elected officials and law enforcement authorities nationwide to fine and arrest people who live on streets and sidewalks, in broken-down vehicles, or within city parks — which could have far-reaching health consequences for homeless Americans and their communities. In a 6-to-3 ruling in City of Grants Pass v. Johnson, the justices in the majority said allowing the targeting of homeless people occupying public spaces by enforcing bans on public sleeping or camping with criminal or civil penalties is not c…