Not to mention, the bigger issue for wildlife management in southern Africa is local poaching for the black market. The vast majority of reasons why certain wildlife species are depleted in this area is because of illegal poaching, not trophy hunting. By regulating trophy hunting and providing local participation, you are providing an economic incentive NOT to engage in poaching and thus ensuring conservation of the species.
I am an avid hunter and virtually all the hunting I do is to fill my freezer. However, I don't begrudge other hunters for hunting under other motivations, such as bagging a trophy, as long as they show respect for the animal. Ethics is a personal responsibility and as long as your ethics are within the legal bounds, I'm ok with that.
As for this specific case, I'm going to take what has been said in the media with a grain of salt. Baiting is a common practice in this area for hunting large cats and there is no way for someone to definitively say that they intentionally lured that particular lion by baiting. If the guide and landowner told the hunter that he could legally shoot the lion, how would he know any different?