There is only 2 avenues that “terminator robots” will exist: 1) criminals and terrorists have their followers/ pay some engineers to reprogram the robots and equip them to kill or explode themselves 2) a rogue nation like N. Korea decides to acquire (if not build) and regineer them to kill and deploys them on their neighbors, etc. The reality is robotics and humanoid robotics is even more complex; chances of this happening may be at a 20 to 30% range (if I was to take a guess).
So often Hollywood serves as a sort of idea test-bed for futuristic scientific concepts that often have a habit of becoming reality, but back in 1984 when The Terminator was released, hardly anyone believed that “killer robots” would someday become a reality.
But today, as robotics becomes a much more mature scientific field of study, the possibility that governments or private entities could “program” killer robots to take out certain targets or even entire populations is not so far-fetched anymore. In fact, it’s downright chilling.