Lone actor adds a new dimension to the global security landscape, not only that of the safety point of view, but most of all the ethical and legal perspectives. As a glocalized phenomenon, it needs global framework with local action. How can security strategies be developed in a climate of continuous dilemmas, with no legal regimes to address the related and emerging threats, lack of international consensus, and arguments that only trigger counterarguments? What is the balance between surveillance for security and civil liberties? How can S&T evolve safely, without hindering innovation? As the forces shaping national and international security become more complex, so do the options the military should consider. Sometimes, defense and moral approaches provide very different answers. The military approach might not always be the appropriate one to security challenges. We need more dynamic political systems to face the present and emerging security challenges, including the lone actor phenomenon. [Note: in this article, there are several terms used for lone actor, based on the relevant slight differences.]