It was unnecesary at the time. Airlines, as businesses, should have clearly stated policies about weight, seat space etc. instead of making decisions once a person is on a plane or purchased a ticket. Maybe a mariginal tax on weight for fuel costs could be added (else other passengers are subsidizing the overweight person's travel), kind of like extra charges for overweight baggage.

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The link in the question didn't work for me, but I found an article on the issue here (http://www.mtv.com/movies/news/articles/1631958/story.jhtml). Here's an excerpt that will fit my answer:

-----quote-----
He continued with acknowledgment that he is indeed a fat man, but he doesn't believe he is so overweight as to be a victim of Southwest's policy. He's "not John Candy yet," he said in the podcast. And he claims to have been able to buckle his seat belt, put down the seat's arm rests and not disturb the comfort of his neighboring passengers.

Yet his issue was originally more about customer service than policy. He believes the way the incident was handled was humiliating, as he was first allowed onto the plane as a standby but was then removed in front of everyone as if he were a "shoe bomber."

Smith claimed another passenger on the same flight was more overweight than he is, and he could see in that man's eyes a shared embarrassment and sudden fearfulness that he was the next to be shamed. On his eventual flight home, the filmmaker sat next to a woman who was also mistreated for her size. "They're coming for the fatties," he recalled thinking during the incident. "They're taking us to Candyland to kill us.
-------/quote-----

If he can put the armrest down and buckle his seatbelt and not disturb neighboring passengers, then they should not be subjecting ANYONE to that kind of embarrassment. I understand that it can be a safety issue, but it doesn't seem that this was the case here. If he had not been able to buckle his seatbelt, it most certainly would have been a safety issue. However, he said he could, I don't have a reason to debate that, so it was a ridiculous move on Southwest's part.

Kevin Smith isn't even that heavy! I mean, he's a big guy, but not "too fat to fly" fat! Not to mention that this is gonna cause some serious bad press for Southwest. Way to humiliate a famous movie director, guys; I'll bet more people like Kevin Smith than Southwest Airlines anyway. lol.

If he can't fit in the seats properly. I think he shouldn't be allowed to fly. For example, if he can't be buckled in, then he's in danger if there isbad turbulence. He's a danger to people around him if he can't stay in his seat.

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