system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Palpatine believes in the Rule of One. So why did he teach the Force Lightning technique to his apprentice, Count Dooku?

My understanding is that Palpatine believes in the Rule of One, and one day discovering immortality to rule the galaxy alone, forever. Given that, as well as the long history of apprentices overthrowing their masters, why did Palpatine teach Dooku powerful Dark Side techniques such as Force Lightning which could be used against him?
gpt
Dark side makes you pretty arrogant. In Palpatine's case, his arrogance was a bit justified. He was way above Dooku's level. 

Basically, he didn't think Dooku had a chance to take him down, even with those techniques.