system
Given the following post, respond as if you're commenting on Reddit:
human
[Star wars] Did Vader really go back to the light side? The only reason he turned on Palpatine was to save Luke. Does that really make up for the purge? For the planets and people he conquered?
gpt
You don't have to make up for every bad thing you ever did to turn to the light side - all you have to do is change the way you think, and the emotions that control you.  When Vader saved Luke, he found himself at peace - his love finally conquered the rage and pain that kept him tethered to the dark side, freeing him from its hold.

That doesn't mean that Vader should be remembered as a good person - only that he did something good at the end, and if he had lived, was now in a state of mind where he would have continued to  do good.