"Look, Mom, that one has a Christmas tree." That's what one of my kids yelled out while we were going with some friends to Teddy Roosevelt Island last winter. It's true, as they noticed, that the homeless encampments along the Potomac were more scenic and elaborately decorated than the ones in New York City. But the effect has been the same. Over the course of the past two years, cities across the United States have been dotted with people living on the streets. As urban residents retreated from public spaces during the pandemic, homeless populations took over. The effects have ranged from parks that reek of urine to people shooting up on street corners and pushing commuters in front of subway trains. One friend had narrowly avoided a can of Redbull that was hurled at his head during a lunchtime stroll in midtown Manhattan.