I think that only people with issues insist on diet sodas
Have you ever considered that people with health problems prefer diet drinks?
But it has quite the impact on the environment.
There is no reason to think that diet sodas are appreciably worse for the environment than any other kind. Furthermore, it is wrong to judge people for their preferences, and assuming that people have issues is cruel.
It's still not right to waste money when you are fat, soda should be buy one get one free.
We should live and let live. Some people think soda is a tasty treat, other people like to smoke weed, and weed cultivation is far more harmful to water sources and the environment than a soda.