I'm sorry, but I don't think that's the intent, to make people neutral. Instead, it is to move neutral back where it belongs. Nor are they meant to suppress emotion, although that can happen. I would consider emotional suppression to be an adverse effect, unless it was the specific desire of the person so affected.

We're all so different, both in how the drugs affect us, and in what we want the drugs to do.

It's matching the two realms effectively that is the hard part to accomplish.

Regards,
Lar