I agree with you. For example nuclear weapons. On the one hand, the invention can destroy the entire planet, and on the other hand, this invention allows for as many years to live without the world wars.
Yes. But that is maybe wrong perspectiv to look from. Because makeing of nuclear weapons made other people make there nuclear weapon and that brings only more nuclear weapons... But you are right, because some strong country cant use nuclear weapon of there because other country have them too. Lets say that with develop of nuclear energy, weapons are bad side, but nuclear energy could be use and it is used for good things too. Nuclear power plants for example.
On the contrary I think that the development of technology is constrained by the governments of different countries. there is a world conspiracy. This is especially true of technologies in the energy sector.