They don't have anything else to do. As long as someone feeds them, they'll hang around and party. Unless they build them a shelter for the winter, these kids will start to get too cold, will find their way home to mom, and refer to it as the best street party ever!
The hateful radical leftists will try to hold out as long as they can, but there aren't very many of those. They want everyone elses stuff, and they won't want to quit until they have it. They'll scream "Gimme, gimme" until someone else (like always) rushes them to the hospital with frostbite!
The people who put this on - Soros & Co - must be expecting the spark that ignites the US into martial law to happen before winter sets in. Awful lot of terrorist dry runs these days. Something is up.