They first create a ridiculously false caricature of conservatives: pro-Hitler. They then use this straw man to justify their horrible crime. Leftism is lies. It is based on lies, proceeds with lies and ends up at more lies.
The ridiculously false characterization of the Hitler-loving conservative is contrasted with the absolutely dead-on characterization of the Stalin-loving liberals. In the end of the play, they do to the conservative what Stalin did to his Nazi nemeses, and really to anyone who opposed him. They may not call themselves Stalinists, but they sure know how to play the part.
It is an incongruous caricature as well, since Hitler was a SOCIALIST!!
Not only are these Marxists hateful, they are astonishing ignorant of history as well!