Philosophy in Movies: Ethics

According to Mary Litch in Philosophy Through Film various major ethical theories are represented by characters in this film. I haven't seen it yet; I'll delve further into these ideas later.

Do the ends always justify the means?

How do we know how the future will be affected by choosing one action over another?

How do you judge relative guilt and innocence? Does it make a difference if someone was "just following orders?"

Is it right to risk many lives to save just one?

Is it ethical to punish someone for a crime he has not yet committed?