Hah, I was about to post a thread on this - good thing I used the search function xD
If emotional trauma is sufficient for Mangekyou Sharingan, then why didn't Sasuke have it prior to killing Itachi? Seeing members of his clan (including his parents) slaughtered, and working with Orochimaru should have been emotional trauma enough. Granted Orochimaru will have helped kill his emotions eventually, but still.
The comment about Kakashi copying the Mangekyou Sharingan can't be right - the Sharingan's forms are all Kekkei Genkai, which can't be copied anyway xD