Ship moral/free will?

[Aq-s'ain]

Do you think that ships should have some kind of 'moral' or something? I mean... How do you think Picard (for example) would react if Starfleet Command would tell him to "attack that planet over there and slaughter 3 billion civilians"? Someone from a bloodthirsty race would probably do that, but peaceful? It just doesn't sound right.