The question about self sacrifice is equally pointless in both cases. But for different reasons.

In case of real people it's an entirely different thing to SAY you would sacrifice yourself than actually do it (easier said than done).

For AI it makes no sense because AI only seeks the best answer to a given question. Not the best outcome. It doesn't care about the consequences of its answer. It's just words. Some words seem more appropriate in a given context so it uses those words.