While, Joseph Faxon would be considered as a traitor to the Humanity in (2010). What he did, that was out of desperation, the will to survive.
He sold out the Humanity's future to save the present. While, the Aschen took advantage of an opportunity as soon as it existed, while continued as they knew he wouldn't say anything, even if he knew, he was their doormat. He didn't go through it in 2001.
Speaking of hardcore doormats, who was James Marrick. Despite everything he did, he changed his mind at the end to stop the Replicators, despite what the I.O.A told him to do.
Many probably would consider Richard Woolsey to be an enemy of the Stargate Command, as he was working for Robert Kinsey. Honestly, he was a lot of things, but never an enemy to anyone.