system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragonball Z] (Minor spoilers)Why was Vegeta so willing to do what he did to Nappa?

Given their history, Nappa was basically a father figure to him, they've known each other since Vegeta was born. Given Vegeta's later "transformation" to be a more ethically sound person, that must have always been in there, at least in a different form (his loyalty to his family later on must have its roots somewhere). It just seems so absurd and pointlessly ruthless for someone like Vegeta to turn on his own like that.
gpt
He's been raised on survival of the fittest, Nappa obviously wasn't among the fittest anymore, and so he was purged. He was beaten by *a low level*, not even an elite or one of Frieza's men. 

4th wall, maybe Toriyama didn't plan him as a good guy yet, or planned him to keep his Namek attitude longer.