I think you are vastly oversimplifying a unique interpersonal situation. I'm not certain how much interactions you have had throughout your life with the homeless population. In my personal experience the ones that would need this type of service are not always all the way there. Not always rational actors. I would expect that yes she could take time and explain what's happening with the waste but that would lessen the amount of people willing to receive help. .What people should be focusing on is that this woman is going out there to treat and help these people in a self sustainable manner.

To frame this another way. If this lady was cleaning streets and creating art from trash and selling it, would anybody care?

Ultimately clipped toenails are worthless trash. It's the work she puts into them to make them into jewelry that has value.