But then HP would not have been allowed to borrow laser printing technology. Adobe and 3COM would never have been allowed to be created, etc. The reality is that PARC was working on bigger money makers like LCD and CD's at that time that a $10,000+ computer and associated tech did not seem like a money maker.
It has been well documented that it was not a one time view of what Xerox-PARC was doing. The engineers worked with Apple and some were consultants on the black flag (Mac) project. That is where the pre-IPO Apple stock to Xerox came into effect as compensation.
Also, keep in mind that the LISA utilized some of the same tech developed from PARC, just not the sexy part.
Just sexier to say that Apple stole the tech, just as it is interesting to say that M$ stole the UI from Apple (though they used an IBM design that they worked with IBM on).