How do the themes in Rhinoceros relate to Nazism?

I think that the most basic idea from the plays help to
bring out the connection to Nazism.  Consider the idea of the transformation into
another form, along with abdication of previously held values as being symbolic of
Nazism.  In a setting where individuals believed so many different and divergent
thoughts, the conformist approach of Nazism blanketed so many people that the
ideological change was fairly shocking.  At the same time, the form in which people
change, the rhinoceros, is a form where brute force and destruction seem to result. 
This is another Nazist reference in reflecting how the result of transformation is not
necessarily one that embraces the subtleties of difference and tolerance.  The idea that
Berenger struggles to be the lone voice of humanity when all else capitulate to
conformity also brings to light the idea of how individual human beings had to fare in
countering the force of Nazism.  There is much from Ionesco's own life in this theme, as
he watched former colleagues join fascist movements.  In the embrace of these
ideologies, they forsake all they believed before and within this, there is much in
shock of such a change.  This was representative of much in Europe at the time of the
rise of the Nazis:

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In conforming to the rhinos’ ideology,
the townspeople become themselves savage creatures. They lose their humanity, their
individuality, their sense of self. Their identities, completely reshaped by their
adherence to rhino values, are transformed by their desire to go along with the herd, to
be just like everyone else, and to play it safe. The extent to which all the characters
in the play, with the notable exception of Berenger, collaborate with the rhinoceroses
makes them, in the end, no better than the thick-skinned beasts. In fact, the people
become
rhinos.

This ends
up becoming a powerful statement about the Nazis and their influence at the time of
their ascension into power.