Yoda is my favorite Jedi ever. His personality is very great. He is wise and quite powerful but also childlike and playfull. And i think that, after the third movie, he felt very guilty and maybe he admitted the mistakes of the Jedi Orders Code.

I admitt that the Jedi Orders Code is quite wise but it is not really right. Since nothing in the Universe is perfekt and everyone makes mistakes. But that is how we beings in the Universe are. Of Course hate and other negative emotions can be really bad, but they are also an improtant homework so that the mind and body can grow up and that we can find some Kind of Balance between positive Emotions and the negative ones. And i think, that in the Star Wars Universe, there is no light or dark Side. Only the Force exist and it depends on the user if he uses it for the light or for the dark.