Maybe one solution is therapy, to help massage them out of their shell, to help them learn to be vulnerable and unafraid and friendly. But many of them refuse to go to therapy for whatever reason also.
These are things I will be running into as I try to resolve this. I have already encountered a young man named Daniel who remembered me, and told me that he was hospitalized, and that the thought of me and my sign helped him get through it. I'm dealing with people on all spectrums of mental health.
In fact, maybe that's kind of the point. I'm trying to reach out to people who refuse to go to therapy, who have internal thoughts berating them all day long, and I have the unique opportunity of helping them through the darkness and into the light of the truth, that they are valuable and lovable, if only people saw the true them, and trusted them to become that.