Why would a junkie want to shoot up in a public toilet of all places? Sure I imagine its better than a park bench in front of the police station, but observing

Why would a junkie want to shoot up in a public toilet of all places? Sure I imagine its better than a park bench in front of the police station, but observing worse solutions doesn't prove something else is the best solution. Their own bathroom? A methadone or other treatment strategy clinic? Its a mere assumption that a culture rich enough to afford places to poop can afford mental health care? Some contaminant in the dirt of the USA that makes it unaffordable here, only affordable everywhere else in the civilized world? If so, wouldn't it be sensible to fix or decontaminate our magic dirt? What, specifically, is wrong with our magic dirt, such that it doesn't work here? I've noticed that since I was a kid, something has developed such that the public library seems to be used as a free day care center for poor people. The solution to that societal ill is probably not to ban libraries, or ban being poor.