Arnold was discovered as a result of the Brit Andre’ being captured with papers in Andre’s possession that detailed Arnold’s plan to surrender West Point to the Brits.
Arnold sought and obtained command of WP to effect this plan.
Prior planning and documentary evidence of his plans make him a flat-out traitor. Yes, he was there at Bunker Hill, etc.
Still, the record shows he planned, with forethought, military treason.
The caller wasn’t comparing McCain’s acts with Benedict Arnold’s as being on the same level. (FWIW she was paraphrasing Thomas Sowell) The point was that previous patriotism in service of the country doesn’t negate current acts of sabotage of one’s country. Anyone who can’t see how thoroughly McCain has sabotaged American interests and the Constitution isn’t paying attention or doesn’t want to.