In the process of explaining one way to act as the chlorine in the gene pool without unpleasant side-effects such as ones own death or incarceration, this article at Kuro5hin points out that:
Don't kill fat people, they're hard to carry.
In other words you may be less likely to be murdered if fat. What is not pointed out, but which is undoubtedly true, is that beinjg fat may also make it harder for vital organs to be penetrated in a timely manner. On the other hand one disadvantage of being fat is that you may find it harder to run away....