It's not only that, it's the Dems cynical manipulation of the masses. They believe that the majority don't have a moral core, can be talked into understanding errors of the heart or judgment or drawn in as sympathizers to victims. This is why they can ask, straight faced, does it really matter if John Kerry lied about being in Cambodia. Well yes it does matter, the context matters, the fact he stood in the Senate and used that information to manipulate people and underline a point about the President of the United States lying to an entire country. How in the hell can't that matter and yet they wonder.
The RATS and the MSM made the specific whereabouts of George W. Bush during the Vietnam War to be of prominant importance. Kerry's whereabouts, and what he has said publicly of where he was, are therefore a wholly legitimate issue.