Like if there were a public restroom near that area. It's at a subway terminal, I'm sure other people have "needs" as well. And if a homeless person needs to take a private crap, well, all the better.
The problem with "public restrooms" that have been tried in california is that they just turn into heroin dens and places for prostitutes to do their business. It's a difficult problem that has seen the occasional actual attempt at a solution