1: "John Kerry never did anything heroic in Vietnam"
Acatually, John Kerry jumped off his swiftboat during a firefight to rescue a crew member who had falled overboard. And why don't you tell me about W's heroism while AWOL from the Texas Air National Guard?
2: "John Kerry betrayed his country"
Oh yeah? Let me tell you this. Out of concern for the troops being killed in Vietnam, John Kerry joined Vietnam Vets Against the War. John Kerry saw his country making a mistake and said so. That is patriotism. The "my country right or wrong" attitude is ignorance on par with medeival peasants.
Actually a front group for Republican operatives aiming to discredit their opponent, Swiftboat Veterans for Truth suddenly appeared during the presidential race. Their attacks were effective despite Kerry's record of combat service versus his opponent's stint in the National Guard away from combat. Kerry lost his election bid and the Swiftboat group disappeared immediately after George W. Bush was reelected.
The verb "to swiftboat someone" has since entered the American political lexicon as a synonym for an ad hominem attack which seeks to discredit a person, usually made by a thinly veiled front group of operatives.