By throwing away the mask he wore throughout a majority of The Force Awakens, it looked as though Kylo Ren had finally become the man he wanted to be in The Last Jedi.
Maybe that’s where Kylo Ren is starting from.
“I feel like almost everyone is in that rehabilitation state [at the beginning of The Last Jedi].
His actions in The Force Awakens will have some serious repercussions on Kylo Ren on Starkiller Base, it was clear that Ben Solo/Kylo Ren had embarked down a path that would only make him an increasingly interesting and tortured villain down the road.