It can be very threatening to be unable to provide for yourself (food/shelter) and be without any identified marketable skills. I spent my youth constantly disenfranchised and often in public settings (either homeless or in worse danger) without any way to explain anything about my experience. From my experience being unable to explain and unable to plan are the biggest threats to safety. Our society doesn't do much to accommodate vulnerable people.
There were people who knew about my situation and wanted to help but couldn't. Several of them have told me that many people who knew the situation were not expecting me to live to see my 20th birthday. I guess I didn't either but never really thought about it.
It wasn't until I was 25 years old and was accepted by public programs that I came to understand how being without the ability to plan (sometimes clinically referred to as executive functioning), for those of us who are already disenfranchised and unable to fit in, we will be exploited by the system by vultures in similar and sometimes in worse ways than being on the streets.
When people wrongly evaluate your approach to the environment as both uninterested in changing your situation and un-empathetic to others' emotions, not being able to explain your situation is only the beginning of the set of traps that are constantly facing you. My experience within the system is a constant reminder that our society is addicted to convenience and the consumption of impulse buys.
This makes it so that many people are in public (whether within the public system or outside of it), and yet don't know how to exchange a service to provide for their survival (which sometimes just means one they can physically or psychically survive). There will always be people who can find ways to exploit that vulnerability. Abuses outside the system are hardly given any attention at all and within the system, there is a great deal of effort that goes into preventing and silencing the reports of abuse.
As for those disenfranchised people who don't die without anyone (or many people) who will do much more than record the incident, many will be victims of various types of slavery, and others will be forced to submit their minds and bodies for research that will give the more valued public more advantages and comfort.
Whether there are specific solutions to these issues or not, the problem itself, is very conveniently ignored. An example of how society treats the disenfranchised is in the following video which describes how the medical industry exploits disenfranchised children. I would hope that during this holiday season where people are involved with family and friends, that there would be more recognition of what happens in public to those who are not providing what society has considered a valuable resource. It's important to recognize that this convenience is not something we can continue to afford.