system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] why did Luke throw is saber away after defeating his father in EP VI?

I mean, didn't Yoda warn him about the Emperor's powers? The force lightning? The general danger that comes from Sidious? And now don't tell me because he "wanted to resist the dark side" because i think trying to defend yourself is allowed as a Jedi...
gpt
Well, Luke had already felt the growing conflict within his father.  

The biggest reason was that he wanted to save his father, and he assumed that no circumstance where he killed the emperor would get him to that point, it would teeter Anakin back towards the Sith way of thinking, that vengeance and anger can be used to achieve positive goals.  It is what trapped him in the first place.

He put all his faith in his father saving him, and prepared himself to bear whatever the Emperor threw at him to get that to happen.