Arrow hunting big game isn't barbaric... It's challenging as hell. Good hunters pull it off year after year. This dude wasn't using an arrow, he was using a bolt, from a crossbow. He may be an idiot, but it's still not barbaric... he's just a very poor shot.
It's challenging to the hunter. It's barbaric (unnecessarily cruel) to the animal. What percent of game hit with an arrow is ever recovered? What's the average time to die? Even a good hit results in the animal suffering for no good reason.
Some sources say it was a crossbow. Maybe it was. But, in several pictures the guy has with big game he's killed, he damn sure used a bow and arrow.