Her broad brush use of the word treason is by design a wake up call for those like Matthews who, unwittingly or not, supported the Clintons, who if not for the internet, Fox News, etc., may have succeeded in dismantling our military, may have succeeded in supplanting capitalism with socialism, which was and is their lifelong goal.
I was a lefty at one time and my wake-up call came when an economics professor, a defector from Cuba, enlightened me to the socialism he had seen first hand, and made me realize "the stupidos I was hanging out with" were not on the right side of the argument.