With some technologies, the negatives are so severe it is difficult to see how they outweigh the positives. Mind-control technology is quite frankly just asking to be abused. It's the ultimate relinquishment of power - you reveal your entire hand to someone else AND let them do what they want with it. I honestly don't understand how some people are so optimistic that they think this technology won't be misused in ways that massively overshadow the good that could be done with them.