How could their son say they were patriotic Americans when they were plotting to overthrow our government?
You're absolutely right. How this guy can juxtapose the concept of patriotism with that of his treacherous parents simply defies logic.
It just emphatically demonstrates how convoluted this guy is to begin with.
They were patriotic all right,though, if you define patriotism as a sense of loyalty; a sense of "loyalty" only to their own meglomaniacal, treasonous, self-interests.