Knives always seem like a perfect example because they really do have so many good uses, along with some bad ones. But just because two pieces of technology both have good uses and bad uses doesn't mean they're morally equivalent. As to your example, even if I trust people who enter my house I wouldn't want to store a nuke in my kitchen drawers :) And there are many ways to discuss the ethics of tech beyond "good and bad uses", such as to what extent a user of the technology controls it or is controlled by it, what are the negative externalities, does it increase power asymmetry, etc.