I know several people who were formerly obese and have achieved sustained weight loss without drugs or surgery. The common factor seems to be that they "hit rock bottom", sort of like a drug addict, and decided to make permanent lifestyle changes in order to survive and stop letting down those who depended upon them. These lifestyle changes are often pretty drastic, and involve more than just eating less and exercising more.
If people want to take GLP-1 drugs and understand the risks then I have no problem with that and don't see it as a moral failing. But they might want to evaluate whether this is just masking the symptoms of some deeper mental health condition.