Because his whole life he's Ben Solo
His life was at stake. Badum psh.
Unmeasurable.
His Holmies
The mooovies. pls tell to friends.
Because it's a First Order approximation.
Kylo Ren: *takes off his mask to reveal his real face* Rey: Wow. Put the mask back on.
Because he has always Ben Solo.
Because for most of his life, he's Ben Solo.