Add me to the three posters who explicate the mysterious way "Duquesne Whistle" works in the piece, and ditto, the comments on Elias and Elizabeth. If anything, the play proper is a prism on the brutal absence of a safety net for all challenged people, all of whom are offered soul-bearing moments of agency and grace. It's a portrait of survival, and the myriad ways human beings cope in the face of insurmountable obstacles. In its melancholy pall, it finds a recognizable humanity that stirs our compassion. I loved these characters. That said, I don't think you can convince someone who feels differently via debate, but it's worth noting how many of us -- here and in the UK -- respond to what this theater piece illuminates and how it does so.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling