Why does Bradbury refer to Ortega Gasset in his book Fahrenheit 451? What is implied about Gasset's philosophy?

The
characteristic of the hour is that the commonplace mind, knowing itself to be
commonplace, has the assurance to proclaim the rights of the commonplace and to impose
them wherever it will.

As
they say in the United States: "to be different is to be indecent." The mass crushes
beneath it everything that is different, everything that is excellent, individual,
qualified and select. Anybody who is not like everybody, who does not think like
everybody, runs the risk of being eliminated.

- This quote
is from Gassett's "Revolt of the Masses." Gassett was a liberal humanist philosopher. 
He wrote about the superior man and the "mass man."  The mass man simply was content
with who he was, the circumstances he was born into.  The mass man doesn't really think
about the future.  He just lets society and the masses push him along as he passively
listens to authority.  The superior man thinks about history and the future. If the
"masses" were to revolt, they would need to do do individually.  Gassett's philosophy
was existentialist in a sense: the individual must take responsibility for his/herself
and for his/her future society.  Mentioning Gassett as one of Simmons' specialty was
purposeful. Montag was a "mass man" and through Clarisse, Faber and notably, his own
curiosity, became an individual thinker.