I cannot speak for the scripts, as I was not involved into that. I assume this could have been handled better, politically.
My personal opinion: If something is free and open-source, anyone can do with it as they please. People fork projects all the time. As long as the commit authors are preserved I do not think anyone has reason to complain. Anyone can check the commits in the repo and see that the actual work was done by the SD2 team and just pulled by MaNGOS.
I do agree that everyone can fork SD2 and do whatever they wish with it. My point is that SD2 started as a Mangos friend project. So I didn't understand the idea of the guys which just wanted to take the scripts from us and integrate them into the core, without adding any additional change, since SD2 is already perfectly integrated in core.
And also without talking to SD2 about it.