You are using a common logical fallacy. Lucifer = evil. Lucifer = morning star. Therefore, the term morning star must be evil. (then taking it one step further implying that Jesus = Lucifer is equal just compounds the fallacy). As others have pointed out, it is a common term to refer to a ruler, it doesn't imply good or evil. The term morning star also refers to Venus and is commonly used to denote the East or Eastward (not sure how it applies here but just to show the many uses for this term).
The pertinent context in question IS about evil; it is not here concerned with various rulers; it is concerned with evil as called Lucifer (a.k.a. Satan) in Isaiah 14:12
God spoke to Isaiah here and God DID NOT intend this to be anything related to Venus or other rulers. Your analysis is fallacious.
If you wish to understand the Bible, you must read it in context when a word is used; not rely on history's usage as a primary source for meaning. The Bible is God's Word to us and His context is what supremely matters, not the worlds understanding, but God communication to us on what He means.