system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why didn't Obi Wan attempt to have Palpatine executed when he learned that he was a Sith Lord. 

in episode 2.  Why did Count Dooku tell Obi Wan that the senate was controlled by Darth Sidious?
gpt
It's believed that Master Kenobi did not connect Darth Sidious with then Chancellor Palpatine. There are many methods of "control" and mind control is one most readily associated with the Sith.

Another factor would be that Kenobi simply did not believe Count Dooku as Dooku was an enemy of the Republic and would have simply wanted Kenobi more uncertain in the organization he faithfully served.