"They just don't react to temperature-based pain the way that you do"
I pitty you if you don't curl up their tail and hold it that way until they quit kicking when you stick their heads in the water.
I saw an idiot just drop one in a pot one time and the thing almost emptied the pot of boiling water with it's tail.
if you keep them heavily iced down before cooking, they essentially are comatose from the cold, and don't struggle like that when you put them in the water.