I have read this book many times over the years and highly recommend it. Don't go by what you saw in the "movie". Bugliosi was the Deputy District Attorney in the Manson trials and gives a thorough accounting of the way Charles Manson controlled his "family" through drugs, brainwashing, and intimidation.
Every aspect of their lives was controlled by Charlie, very much in the way we see today with the polygamists in Texas. As with these people and many other cults, they TRULY believed in everything they were being told and did not dare to question.
Charles Manson believed that the Beatles were messengers from God and that they were communicating to him through their music. They told him that the "black man" was going to start a race war and that they would kill all the white people in the world but that they would be unable govern. They told him that the black people would seek him and his family out in the desert and hand over the reins of power. He preached this dribble constantly, in combination with drugs and brainwashing in the seclusion of a ranch in the desert. Followers were not allowed contact with any outsiders or family. He even renamed everyone. He also threatened to kill followers who tried to leave and some did disappear (Bugliosi speculates that they were either killed or a few managed to escape). What is known is that some simply vanished, never to be seen or heard from again. Many children were born into the family during this time and were moved to different spots to be raised by other followers. Charlie tore these children away in order to control and manipulate their parents. After some time, he became impatient for the war to begin and ordered the killings. He tried to make the murderers look gang related. He thought that the crimes would be blamed on blacks and would "spark" the race war.
For some of his followers, after years in prison, I think his control over them wore off and they began to realize the horror of what they had done. So many lives destroyed on both sides because of Manson. Most of the children born into the family were put up for adoption and their records sealed.
I have watched interviews over the years with several of the woman and do believe they have remorse.
With that said, do I think they should be ever be paroled? Absolutely not!
But I don't think I will be dancing on anyone's grave either.
JMHO.