It's a combined effort bro, the coaches are mostly to blame but the players other than about 5 of them have no heart.
Don't be an idiot, I know that's a tall ask, like getting Les Miles to field a capable offense, but no minion likes Julio Jones.
I think it is a symptom of a lack of coaching. That said, they have to look inside themselves and step up if they want to win, because the coaching won't step up.
It's not that they have no heart, it's that the came to the same realization after the Bama game that comes to most LSU football players eventually. Namely, as long as Les is the coach, they aren't winning squat.