I think you are mistaking "technology" as a principle for "technology" as tools and objects. Technology, as referred to in this "meme" is merely "the science of craft" and has no moral component on its own. An iron maiden or a wheelchair may have been made possible by advances in technology as a whole, but came into being through the imagination of an individual, or individuals, who created a tool to fulfill a (moral or immoral / good or bad) purpose.
The underlying technology (metallurgy, ironworking) used in the iron maiden is the foundation for innumerable instruments of a constructive nature, as I'm sure the lightweight steel and rubberized wheels that made modern wheelchairs possible have found plenty of applications in military hardware or other "evil" devices.
Maybe using a gun as an example was a poor choice for this "meme", as it's hard to put a positive spin on a killing tool. But I believe the message is that inventions, with respect to humanity, can be wonderful or terrible, but "technology" is no more good or evil than the physical laws of the universe. Hope that's a little more fathomable.