Attention Men: Do NOT rape. Rape is bad. You must not do it. Please. Spread the word.
On that note, since robbery and murder still exists, it must be because people are not told they ought not to do it. Imagine the societal ills that could be cured if people just knew it was wrong to commit crime! We wouldn't need locks, or guns, or alarms or anything. Just imagine the tremendous costs savings in preventative measures.