Pat
Three Thousand Club
It's not about the lobotomites. It's about collaborating with abominations like the members of the Think Tank that are proven to have ruined a good part of the Mojave wasteland with their uncontrolled technology. And you want to resume exactly that. I see no way how you can keeo the Brotherhood on your side with that.
You really haven't finished this DLC. That video I linked is a good start, but it isn't exactly the ending my Courier did. Basically four out of the five Think Tanks stand up to Klein, saying how the Courier is great, and then Klein realizes he would like working for the Courier. I'll look for it.