Let's say, for the sake of argument, you have a pill that can make people feel really positive and boundless, that they love their lives and nothing could make them feel better. This pill will work regardless of their circumstances. On the other hand, their environment is horrible: they are in poverty due to societal injustices and systemic failures, and loved ones are dying from completely preventable diseases due to those same societal failures.
Works like The Matrix explored this theme in an extreme form, almost to a fault, where the premise is so absurd that it becomes dismissed.
It's difficult to argue about treatments that will help people feel better and be better in their lives, whatever that means for them, but I can't help but be angry, even furious at the paradigm that underlies current behavioral biomedical research, where everything is seen as being a problem within the individual. It's not so much that there's something wrong with doing research like this, it's that other research, focused on more environmental factors, is seen as soft or unsexy, or the domain of some other field, or some such thing.
I can't help but feel that our society is hurtling at astonishing speed toward an ethical crisis that gets almost no attention. What happens when we can alter behavior and experience with extreme precision and power, but still live in a worldview that treats individuals as the primary determinants of their own fate? What happens when withholding treatments or enhancements becomes a salient problem, when opportunity costs become a form of corruption?