Its been over 3 years since he betrayed him/them and in wrestling years that's a while plus it ain't like Seth has never gotten his comeuppance for all that he's done.
Kayfabe wise, after Samoa Joe injured him is when he started feeling guilty of his past actions and admitted he was wrong.
Thats what im saying
Samoa Joe shouldve been his wake up call
But he shouldve remained a scum bag, but one trying to do the right thing