As we know, Thebes (during the time of Leonidas) sided with the Persians against Sparta, Athens and the other city states. I don't know if they thought "better red than dead," but they clearly didn't want to fight the Persians. Their natural inclination seems to have been more or less pacifistic (or at least leaning in that direction) at that time, but that changed: Plutarch in a "longer version" of one of the collections of Sayings of Spartans wrote: "[Agesilaus]was making war constantly on the Thebans, and when he received a wound in battle against them, it is said that Antalcidas remarked to him: 'What splendid payment you are getting from the Thebans for your instruction of them, since you have taught them how to fight when they had neither the wish nor the capacity to do so.' In fact at that period the Thebans are said to have excelled themselves in battle because of the Spartans' many campaigns against them. This was why Lycurgus of old in [one of] the so-called rhetras [pronouncements, laws] forbade frequent campaigns against the same people, so as to prevent them from learning how to fight." [Cartledge op. cit., pp 220-221] Lawrence