Marshawn Lynch should be fired. He is a hypocrite of the first order. Standing for the Mexican anthem while kneeling for the American anthem, while pretending he's doing it for "human rights," only proves he doesn't know squat about human rights in Mexico.
Being good at football is what got him a spot on an athletic team. They don't give those away for ideology or good behavior. That said, his protest against his own country while declining to comment on a host country he doesn't know that much about actually demonstrates integrity.