The article specifically addresses this point. The argument is that both public and private spaces are highly regulated, so having a space of your own is nessas

The article specifically addresses this point. The argument is that both public and private spaces are highly regulated, so having a space of your own is nessasary for freedeom. If society would let the homeless people do as they like in public spaces then this argument wouldn't hold. However, such a policy position also gets massive political backlash.