Maybe you could start by talking to many people with ADHD who feel that it allows them to still be themselves, yet live their lives more productively and in synchrony with their own values when they are medicated. Not that medications can do this for everyone with ADHD, or depression, or diabetes, or any other condition. But why do we not bat an eye about individuals being on chronic blood pressure medication, or insulin, for "physical conditions" but, we have moral judgments against those doing so for mental health conditions.

And medications are not the only sources of relief or help for ADHD. A variety of CBT strategies can help, and research is exploring whether neurofeedback or other approaches work. The goal is not to achieve conformity, but to alleviate suffering, and allow people to live the lives they want, rather than being constrained by limits imposed by their conditions.