Fat activists have nothing in their lives beyond their gluttony. They would rather waste hours of effort and energy on rationalizing their excessive lifestyle than to just put down the fucking fork. Their lives are centered around eating too much all the time. And when you're down the FA rabbit hole, it's a nightmare to get out of since doing so would make you an evil diet pandering shitlord. If they got sense knocked into them somehow and were to lose weight they would have absolutely nothing in their lives since they center their existence on the pounds of fucking fat they've accumulated and all of their friends and social status stems from that fact. Tess monster would just be another average woman, too old and short to be a model if she was human sized. If a human sized version of her walked into a modeling agency she'd get laughed onto the street. Raging Chestpain would just be another unathletic but normal middle-aged woman if she was human sized. Nobody would give a shit about her or give her any credibility if she was 120 lbs. and ran a 13 hour marathon and entered some shitty local dance competition or ran some run of the mill suburban dance studio.