system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] The Jedi are always warned that it they succumb to the dark side, it will consume them till they essentially lose their identity. This is clear with Anakin/Vader and in a sense, Maul. Palpatine/Sidious and Dooku/Tyrannus don't seem to be consumed in the same way. What's the reason?

To add a few more points:

Anakin was consumed by the dark side, he almost completely destroyed his identity and became Vader. Maul also loses his mind in the end. Both of them are essentially used by Sidious to do his bidding. 

However, this is not the case with Dooku (or Sidious). They both preserve their original identity and do things by choice. They're not consumed in the same way at Vader and Maul.

What is the difference between them? Why is it that some Sith are consumed by the dark side and become slaves to it, while others control and wield it?
gpt
Dooku was Yoda's apprentice and Qui Gonn's Jedi Master. When he left the Jedi Order, it was over the protest against the corruption of the Galactic Senate and indirectly the traditions and inactions of the Order. A scant decade later, the former Jedi turned Count was already willing to enslave entire colonies, commit genocide, and participate in a grand conspiracy to murder all of his former friends and colleagues.

Yeah, the dark side corrupts.