He killed it for sport, the rest is an excuse. If he were concerned about the community food supply he could have donated food. Anyone who hires "booth babes" for spokespeople and is a fan of 24 (a show I used to work for) hunts because he enjoys it. Bob Parsons does not spend thousands of dollars to kill elephants for humanitarian reasons.
Well I think you'd be hard pressed to find a hunter in the US that hunts only for the food gained. Maybe spending 70,000 dollars is sick, but I would hardly call those who hunt for "sport" sick. I myself have never hunted, but I imagine it satisfies some urge in those who do it.