Original sentence: This opposition has sometimes been hindered by a focus on specific issues, and on occasion by a belief that the benefits of certain new technologies are obvious when in fact many people do not understand the technology in question
Edited sentence: This opposition has sometimes been hindered by a focus on specific issues, and on occasion by a belief that the benefits of certain new technologies are obvious when in fact many people do not understand the technology in question (or when the proponents simply do not recognize the harm)