Homeless people (disabled, those with criminal records, registered sex offenders) need some place to go, so they go to the library and parks. Republicans created this homelessness mess by requiring everyone and their brother to register (even streakers) and by allowing employers to discriminate based on a criminal record. Americans used to discriminate against blacks, but then that became illegal, so they stepped up discriminating against others. They'd like to discriminate against Muslims, but somewhere in the Constitution it's prohibited.