If some kind of fancy new gizmo crops up in a Doctor Who episode, theres around a 70% chance that its either going to foul up and start causing deadly mayhem, or that someone or something with a malevolent agenda will use it for their own ends. You could practically set your watch by it. And then that watch will go off the rails and try to kill you. Supercomputers? Check. Medical nano-droids? Check. Hive mind-suppressing technology that allows you to enslave an entire species... okay, that one was a disaster waiting to happen. Basically the rule of Doctor Who and technology is that almost every significant advance is going to kill someone. Which the creators of such advances dont help by either stating something like Nothing can go wrong, or striking bargains with aliens. And hand-in-hand with new technology causing a mass slaughter is the creator either being killed by it or betrayed by the aliens manipulating it. Its pretty much an unwritten law for this kind of plot to end in ironic punishment. Its certainly an overused trope both in general and in Doctor Who but its so firmly entrenched in the programmes history that its practically a tradition to have it crop up at least once every few years. Which really makes it a miracle that humanity makes it to the year 100 Trillion without suffering some kind of apocalyptic Sky-Net scenario.