What's the point of working out if you're going to be a skinny pussy who's still going to die from heart disease anyway?
Judging other people for their life decisions is something I don't want to get into that much around here, but you must understand that these things are multifactorial. At high levels of "sport", if you consider powerlifting a sport, almost no one is obese except in the super heavy weight divisions. Do you think powerlifting made them this way or that, perhaps, they were already obese but liked powerlifting? Fact is, some people might have different values than you and that's okay. Also, obesity doesn't cause heart attacks. It's merely a symptom that frequently (but not always) presents alongside underlying pathology.