I don't think the vast majority of fat people (at least none that I know) are sitting around looking for reasons to stay fat. They're living their lives as best the can, and either their priorities or their ignorance are keeping them in the situation that they are in. That's true of every single human being on the planet though, and not confined to fat people.
I think some people are bothered by this type of research because of a fear it might "give" people excuses. I think that's hogwash, because excuses don't find people, people find excuses, and just having a new one available doesn't increase the number of people using them, because the old "lame" ones still serve people well (I'm too tired, I'm too busy, it's too expensive, I don't like vegetables).
The excuses people make for not saving money, not spending more time with their children, not being able to save money, not having time or money to give to the charitable causes they would like to , not taking a vacation, not cleaning the house, not going to the doctor, not mowing the lawn ..... they all come from the same place. Priorities and ignorance, as simple (and as complicated) as calories in/calories out.