Sampley isn't questioning his heroism; he's telling him not to use it as a shield. What he's questioning is McCain's actions regarding POW/MIA issues while in the Senate.
I’m not so convinced about his heroism.
Yeah, he served and some quite horribly in the Hanoi Hilton.
But he cracked in ways and to lengths that far supposedly lesser men never stooped to.
And his horrific treatment of Viet Vets . . . his treasonous activities and values . . . his hot-headed self-serving arrogance . . .
The most I’d care to vote for him for would be cesspool cleaner in Siberia with Shrillery chained to his neck.