Why Do That:

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Because natural language processing without understanding the underlying emotions is impossible. 

What:

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Okay, so lets start understanding this by trying to find an answer to this question:

I guess, still no web search(??) takes as an input a question and understands the question and does a search for answers to that.
How to do that ?

The application to such is manifold. For example, some govt. agencies might be interested in finding "How many red cars exist in Bangalore?"

Or, some legal intercept developer wants to intercept all the communication by just typing in "What people are talking about New Delhi and violence?"

Etc. Etc.

Remember, after some incidents, police asks for help in investigation. Some people approach the police after that, saying they saw some people acting  "suspiciously". How are we able to process these things ? Can we make a "machine" capable of doing that ?

Reference:

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Computer_method_and_apparatus_for_extrac.pdf
Monte_Carlo_method_for_natural_language_.pdf
Probabilistic_system_for_natural_languag.pdf
Search_engine_with_natural_language_base.pdf
Systems_and_methods_for_word_recognition.pdf