Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Jerry Springer
Steve Wilkos Show
"Devil Mom." Oh dear god, "Devil Mom." So much that even Steve ended up breaking down after giving the aforementioned "mother" the calling out she deserves.
Similarly, "Jailed for Life," about the mother, now in prison for life for her complete obliviousness as to what happened to her child, of a 4 year old boy who'd been burned, scalded, beaten, and killed, because his mother's boyfriend thought he was a homosexual. He thought a 4 year old was gay, so he tortured and killed him.