John Kerry's Purple Heart was boob bait for the Bubbas. If it had served no purpose to the left, no one would have ever even known Kerry had it.
John Kerry had three PHs, all of them questionable, especially the first one, and none requiring any hospitalization. By virtue of having three PHs, Kerry was able to curtail his one year tour in Vietnam to just 4 1/2 months in-country using an obscure rule.
P.S. Kerry had a personalized MA license plate "PH3" on his car. He liked to advertise his "hero" status.