They're the kind of people who cite Set Point Theory.  "It's impossible for me to lose weight, my body fights like hell to stop weight loss."  But then their weight spirals way above said "set point."  If "it's impossible for fat people to lose weight" theories were taken to their logical conclusion, the takeaway would be "never, ever, ever get fat in the first place.  Avoid excess weight like the plague.  Take draconian, Herculean steps to ensure people never become fat and fuck up their leptin levels and other things," not "it's normal for people to be fat."    We know this because of how American society treats drug addictions like methamphetamines that are very hard to quit.   We aren't told "quitting meth is extremely hard, so accept meth addicts," we're told "DON'T DO THE DRUG EVEN ONCE.  DON'T GET ADDICTED."     These are the same people who worship "Onederland" after all.  And "Two-topia."  They're past the point of recognizing the hard medical facts about BMI that insurance companies and doctors know.  If American society were as rigorous about those facts with Homo sapiens as it is with pets in the veterinarian's office, it would be doubleplusfatshaming.    And that's the clincher--even from an ethical perspective that does not take "humans are at least as valuable as your pet dog and possibly moreso in the case of good humans" as an axiom.  An overweight pet will have a bad life, be unhappy, and die.  An overweight human has lots of additional societal consequences.