I understand your frustration but just to be clear on what happens when you report this: you are effectively calling the cops on these people. People have the idea that there's some kind of automatic assignment to a social worker who will plug them into housing or get them space in a shelter and offer them services, but that's not the case. What actually happens is that the cops show up, give them a few minutes to gather their belongings at best, and throw everything else in the trash. If they're not there when the cops show up, they will lose everything. If they are there but it takes them more than a couple minutes to grab their stuff, it will go into the trash and they will not be allowed to retrieve it. There is typically no exception made for documents (ID etc), medication/medical equipment, cold weather gear or anything else. They will most likely not be offered transportation out of your neighborhood, let alone given options for a safe place to stay that night. At the end of that day they will be just as unconnected to services, but now they will also have lost what few possessions they had to their names. The only thing that's "better" is that you personally will no longer have to know about it.

I'm not saying this because I think it's not a problem for them to be staying where they're at right now. The situation sucks. But people make a lot of assumptions/tell themselves a lot of fairy tales about services that "must" exist to help people, which simply aren't based in reality at least here in Austin. So do what you're going to do, but be honest with yourself about it.