Okay I can see your point... sort of... but Itachi had no other options. He killed his clan to save not only the lives of everyone in the Hidden Leaf but Sasuke as well. He also did this to save the clans name. In reality Itachi was working to try and have the best outcome for everyone. You mentioned that he killed his parents after they said they were proud of him? Yea and he fought through tears of utter sadness to do it. If you really want someone to blame, blame Danzou. He forced all of this. The third Hokage wanted to come to a diplomatic conclusion but wasnt given the time needed. One more point also... he decided to take this burden on as his own... all of it. I can only imagine it wouldnt be an easy thing to do...