Outside legal spheres, the word "traitor" may also be used to describe a person who betrays (or is accused of betraying) their own political party, nation, family, friends, ethnic group, team, religion, social class, or other group to which they may belong. Often, such accusations are controversial and disputed, as the person may not identify with the group of which they are a member, or may otherwise disagree with the group members making the charge.
I am aware of the connotation that you sited. But my point is that he is being tried in the media, and perception matters. So, no, I don't think it's OK to label him as a traitor.
Some will say he is a hero. Some will say he is a traitor. Someone is not imprecise because you disagree with something they consider to be a truth; It is a matter of perspective.
http://en.wikipedia.org/wiki/Treason