Originally posted by Red Superfly
He threw his saber down in the exact same way he jumped to his death in Empire Strikes Back, he had to defy the emperor.He did say he wanted to turn Vader back, and was trying hard. He still hung on to his hope that Anakin would return, even when he was dying, and his faith was rewarded.
It's a plot point to show that love and faith are ultimately more powerful than physicality and violence.
It's made even more clear in Episode III. Windu had no faith in Anakin, and his lack of compassion led to his downfall, as Anakin turns on him. Luke instead decides to rely on Anakin, which brings out the good in him.
The fight with the darkside could not be decided with a lightsaber. A lightsaber could not redeem his father, only trust and love could do that.
If he wasn't coming back with his father, he wasn't coming back at all.
That's the impression I got.
And a good one 'tis.