Quoting the Unabomber was a strange choice considering the main idea isn't unique to him and stands on its own merit:

"Instead of removing the conditions that make people depressed modern society gives them antidepressant drugs."

Examining the social factors that contribute to pathology isn't controversial nor does it downplay the role of drugs in reducing harm.

That is the definition of an ”ad hominem” argument.

I'm comfortable with "ad hominem" when the appeal in question is to the Unabomber.

You wish to vilify him. That's fine. It's extremely uncomfortable to find that this mathematician was right about something. I respect your feelings. But that doesn't alter the substance of his social critiques.

Sure it does. It's strange to argue that it wouldn't. Kaczynski is a madman, and perhaps the only person in the history of the United States whose quality of life was drastically improved by incarceration in a Supermax prison.

I doubt he would agree with that, just like depression has many forms so does the concept of quality of life

He lived out in the fresh air and sunlight.

So do rats.