Mel Robbins’ best-selling self-help book, The Let Them Theory , has clearly struck a nerve. After selling more than seven million copies and topping The New York Times, Amazon, and Audible lists in 2025, it’s safe to say the message resonates with a wide audience. The core message from Robbins is that much of our stress comes from managing others’ reactions, expectations, and approval. When we “let them” think, feel, and act as they choose, we free ourselves to make decisions