They see Heaven's Gate and the history of Christianity as one in this violence. They would like to circumscribe the use of reason and other human faculties to our common life, where values like life itself and human relationships reign supreme. As I said, I have sympathy for this position. In the parable of the sower, Jesus describes the action of the kingdom of God as being like seed that falls into the ground. Some falls by the wayside, some on hard ground, some gets choked out by weeds.
Some seed falls on good ground, however.
The growth of the kingdom occurs out of view, in a hidden, secret way. It proceeds by processes that are reliable and yet mysterious. The kingdom's methods demand that its adherent-believers be patient. We have to trust. I imagine the leader of Heaven's Gate, Marshall Applewhite, told his followers they had to trust as well.