Because obviously, there can't be another reason.
Articles like this are rathermuch like a thin person writing, "Fat people are just selfish and eat too much!" Well, maybe a good number are and do. But maybe it's a little more complex than that for a large minority of obese folks. People would do well to know more about someone before making a pronouncement like that.
I think I'd rather be called selfish than hang out with a blowhard like the writer. That saves me two hours every Sunday and Wednesday I could be doing other things. I'm thinking cleaning the mould out of the crevices of my shower brings more glory to God, thanks. :)