This healthcare stock's plunge presents a great buying opportunity. An old country song morbidly titled "Gloom, Despair, and Agony on Me" included the lyrics, "If it weren't for bad luck, I'd have no luck at all." This might be an apt motto for UnitedHealth Group (UNH 2.07%) these days. The healthcare giant continued to disappoint investors with its 2025 second-quarter update, revealing that full- year earnings will be worse than expected. The U.S. Department of Justice (DOJ) is conducting an investigation ...