Actually, even though Jones did condition people, the majority of the folks in People's Temple stayed because they believed in the cause. They believed in the cause and in the other people involved.
Most of the folks there that day were killed - murdered - including the folks at the airstrip. They were shot, while back in the pavilion, there were babies being ripped from mother's arms, people being held down and injected and children being force-fed the poison via syringes or through drinking it from cups.
I've had this point explained to me by a survivor -
It's like the experiment of the frog placed in boiling water. If the frog is placed in boiling water, it will jump out, due to the temperature. If a frog is placed in a pan of cold water and then it is heated up slowly, the frog will not notice the changes and will eventually boil to death. This is the way it went in Jonestown. All of the changes in Jones took place so slowly that many did not even realize he was drug induced most of the time.
The people stayed for each other. They stayed for the cause. They were doing very good things in the community. They thought that would be happening in Jonestown as well. Unfortunately, they all learned this wasn't the plan Jones had. May those that died all rest in peace. May those that lived all live in peace. May those family members who lost so much in such a tragedy, all love in peace. May the public, some day, understand all of this, with peace. It is what it is. They can't change what happened. However, they tried. They didn't sit back and watch the world abuse the poor, elderly and black folks in their community. They joined a cause that they thought could make the world a better place. I feel their minds were conditioned, for sure, however they were led down a bitter path while believing they were lighting the way.
Due to the courage it took to work against the grain of society to create a better place in that era - I believe it shows how powerful their minds, souls and hearts were. It's just too bad they had an underlying current of dysfunction fighting them the whole way.