Of course the vaccines had benefits for some demographics.

Benefits? They'd actually have to do something, aside from the side effects, before you can argue they had a benefit for anyone. It's never prevented infection, it's never prevented transmission and it's never been proven to have any other benefits either.

Or are you telling me that a morbidly obese 80-year-old with diabetes should not get it?

The only reason they should get it is if they want to die faster. Unless you're trying to argue that blood clots or myocarditis are beneficial to your hypothetical person.