Arnold’s problem: The soft heart of the Terminator

Most of the reviews for "Terminator: Genisys," Arnold Schwarzenegger's latest turn as the shotgun wielding robot from the future have been negative. Critics have complained about the confused plot, the milking of over-used one-liners from the previous films, and the surprising weakness of the cast supporting Schwarzenegger in his fourth Terminator film.
All true. But few have hit on the central problem with this film, and, indeed, most of the films that make up Schwarzenegger's attempt to revive the film career he put on hold in 2003 to be governor of California.