".....cannot fathom the reason Kerry wants to constantly remind people of how traitorous he was when he came back from Viet Nam."
IMHO, it's a combination of factors.
First and most obvious, kerry's playing to his base.
The other factor is kerry's very own little private victory dance since his legal team and the ever-cooperative MSM have either litigated or slandered the Swift Boat Vets into silence, and he now thinks that he can tout that Viet Nam issue with absolutely no downside at all.
OTOH, and just for kicks and giggles, Google "Kerry + Viet Nam + traitor" and see if you get "over 20,000 entries" as I just did......
Swiftys may have been forced to Stand Down, but they were really only point man for the rest of us.
Payback is truly a b***h. Especially when long overdue.