Everyone is asking what kind of a person could do such a thing?

Graham Dwyer was an expert psychological manipulator, writes Dr Patrick Randall.

In the wake of the trial that has gripped the nation and the revelation of the gruesome and disturbing details of how Elaine O’Hara spent her last hours, the question on everyone’s lips is “what kind of a person could do such a thing?”

Is Graham Dwyer a cold heartless psychopath with no capacity to empathise with others? Is he a man whose moral compass was so vandalised by events in his life that he had little choice in his actions?