It's impossible to say what any psychopath's True Will might be. I feel the True Will is individual.
For example, it's not uncommon for people to think they want or need something, and then work at achieving, obtaining, or manifesting it. But in reality, this desire or need, or the drive to achieve, obtain, or manifest it, came from another person connected to them. Then, this was not the person's True Will.
Other than the obvious divergent wiring, I don't see how a psychopath is any different from any other, regarding their True Will.
Unless I've misunderstood.