Orcas had many chances to kill and eat humans but they never did it. They don't see us as food. Probably their intelligence makes us interesting to them. And they don't have problems getting food from any source they want, so I'd take hunger out of the equation.
«The orcas return to this noisy, polluted stretch of water for one reason – to feed. They specialise in hunting bluefin tuna, also highly prized by humans. The near collapse of bluefin tuna between 2005 and 2010 “has led this orca population to the very edge, with about 30 adults left”, says Pauline Gauffier, who has studied them.»