How much of the data was done independent and how much was done by the same company or companies that benefit from it? We've seen this before. How many decades did people take aspirin thinking it was good for you to take everyday. How many decades did people drink wine thinking it was good for you in small dosage? How many people smoked using it as an appetite suppressant not knowing the long term effects?
The list goes on forever. I'm betting this ends the same way.
Dude, the mortality rates go up at least linearly, maybe super-linearly, to weight over a certain amount. It's not like some mythical / hard to read / later benefit. This is a drug that radically changes those risks NOW, really quickly. It's a different matter than aspirin (helpful if heart disease is a real risk, otherwise no) or wine or smoking, both of which people have a strong interest in thinking of as good for you.
Yes being overweight is horrible for you. But fixing it with a pill that you don't know the long term effects of and not actually fixing the root of the problem. Why you gained the weight in the first place. Is helping no one. If anything you could be fixing something in the short term and causing long term harm in the ladder.
We've got 20 years of data on this class of drug. Certainly there could be some long term issues that we're not aware of yet, but it's not likely that there are significant issues that affect a large percentage of users after 30 years that didn't affect the small sample of users that have been using it for 20 years or the massive number of users that have been using it for 10.