No one's spoke out about the Clintons because most of them are criminals too. Those that did like Juanita Broaddrick, Paula Jones, Kathleen Wiley and the others were ridiculed and demeaned, but it didn't stop them then from speaking out, nor has it stopped them now. People with principles and self-esteem don't tolerate scumbag behavior.
Stillington shouldn't have had any fear of stepping forward with the knowledge of Talbot having been married to Edward when she married Butler in 1449. Edward hadn't met or married Elizabeth yet. He wasn't even King until 1461, and would have been only 7 at the time Talbot married Butler.