Well, Adele Goldberg, head of the Star, and who held the meeting with Jobs, is still around and would tend to disagree. She fumed at the idea of sharing the GUI and had to be strong-armed into giving away the technology.
You might want to read "Dealers of Lightning" which details a lot of this. It's a great read.
Adele is right that the Star pioneered graphical computing. I a somewhat amazed at how little credit people today give to Xerox PARC team. But to say that it was stolen is misleading. The Mac was not a clone of the Star but a derivative system with usability improvements and resource compromises to allow it to run on consumer hardware. (Compare this to Windows, which was a half-hearted implementation of the Mac, compromised to run on common consumer hardware.)
If Xerox had actually productized the Star, it would have sat on the desks of publishers and C-level executives, and probably have been mostly forgotten. Jobs certainly stole Adele's thunder, but I think that he did the right thing.
You might want to read "Dealers of Lightning" which details a lot of this. It's a great read.
I'll check it out. Much of this was also covered in Triumph of the Nerds.