These guys are obviously not anti-technology bigots, but they know there's something to being prudent and keeping the big picture in perspective. The purpose of technology is to aid mankind, not replace it, fix it, or supplant it. Seems like some of the people who are at the edge of technology and are aware of its potential to exceed its mandate are urging us as a society to slow down and not sacrifice our humanity at the altar of "progress" because we're in awe of the possibilities of what the technology can do.
Caution is not overrated. There are such things as unintended consequences. In fact they're everywhere and we just refuse to see them because we like our shiny new toys. I'd even say that for every benefit of anything, there are several unintended consequences.