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Understanding the Context

The very fact that an incest taboo exists at all indicates that it was a common thing in society. History is rife with stories of romantic relationships between family members. I've also heard of the taboo and forbidden nature can also cause some sort of reaction for people too which doesn't necessarily mean you want it as a real desire either but can still be arousing at the time. "why" can be compared to an old Latin form qui, an ablative form, meaning how.

Key Insights

Today "why" is used as a question word to ask the reason or purpose of something. This use might be explained from a formula such as "How does it come that ...". If you meet an old friend of yours, whom you never expected to meet in town, you can express your surprise by saying: Why, it's Jim! This why in the ... 11 Why is it that everybody wants to help me whenever I need someone's help?

Final Thoughts

Why does everybody want to help me whenever I need someone's help? Can you please explain to me the difference in meaning between these two questions? I don't see it. Why is a just a rather odd wh -word. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable. Consequently it behaves strangely, as you and others point out.