However, we have these other goals that supersede modding; we want to provide a safe and secure experience for players to play in and trade items in, and in order to do that, we had to make the game online play only. Once we made that decision, that effectively eliminated the possibility of having moddable games, since you’re going to have to connect to our service in order to play. So that’s a slight consequence of our online-only decision.
1) Online only
2) Blizzard wants there to be safe and secure trading (and playing).
So...what's the ACTUAL reason they are not making D3 moddable?