All my life I’ve believed that the death penalty is unacceptable – a barbaric and out-dated act of vengeance that has no place in the modern world. But that conviction has been sorely tested.The case of David Fuller, who not only took the lives of two young women – Wendy Knell, 25, and Caroline Pierce, 20 -but also admitted 44 charges of necrophilia, involving women and girls aged between nine and 100 in morgues across Sussex and Kent, is beyond…