True, but on the other hand, what if it is an option and we're depriving some people of a normal, happy life by not researching and making available a simple medication to regulate e.g. their thresholds for violence, aggression, empathy, self-discipline, motivation or wakefulness?

We have similar ethical concerns with regard to e.g. cochlear implants. We don't force people to have them implanted, but it would seem cruel to not make them available because the availability may, at some point in the future, make them semi-mandatory.