My brother was a Marine, my Dad wounded at Cherbourgh in WWII, my brother-in-law a Marine drill sergeant who came home from Nam and died to PTSD, my wife's Dad killed in Germany, active duty, in a jeep accident. I couldn't get in because of a blasted knee (1978 - they were drawing down and not really looking for folks). Whole family, both sides, military.
To a one, they would tell you that they fought so that Kapaernick could do that. None of them would like it, but all of them, and I, would defend his right...and that's the whole point.