This is the tyrant's option. If you have your social
engineering set so that there's just no way you'll ever be able to control
your drones by pacifying them, you're left with two options: nerve stapling or
the Punishment Sphere ( the Telepathic Matrix
secret project dosen't come along till late in the game). Nerve stapling is, of
course, an atrocity. It will cause other factions to induce trade sanctions against
you, and forcible pacification equally well ( with the added bonus of increased
resistance to mind control ), and is not an atrocity. However it does come at
a price....the crippling of your research efforts .
If you're going to need this facility, don't build it until you absolutely have to. Once you do build it, mobilize as quickly as possible for final conquest. The point is to keep the loss to your research as late and as short as possible. If you're trying to grind Planet under your heel, you absolutely do not want to lollygag around while your enemies rack up a significant technological advantage - a techologically superior faction can do some serious damage to a foe that far outnumbers them.
The Paradise Garden and the
Punishment Sphere are antithetical facilities. You can build one in any given
base, but you can never build both.