system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What prevented Anakin from having a petulant "Kylo Ren" personality in his Sith years?
gpt
A Sith masters his rage; he does not allow his rage to master him.  Anakin let his anger cloud his thinking and lost everything as a result.  Vader would never make that mistake again.

Kylo, on the other hand, never had to face any consequences for losing his temper, so, like any spoiled brat, he keeps doing it.