I've been thinking about how the Allspark brings things to life in the Movie universe - and how everything that brings it to life is inherently hostile to humans. I was also thinking about how Optimus Prime said that the Allspark gave all Transformers life, and how Starscream & The Fallen talked about the need for Energon to bring more Transformers into existence properly. There's also the small matter of how Optimus, a machine, can be descended from the other Primes. So here is what I think: The Allspark grants the spark of life to the otherwise inanimate Transformer. The spark can be given directly, or come from a stored reservoir of its power, Energon. Spoiler This is what I believe the coccoons on the Nemesis were for, especially as Starscream mentions the new Protoforms were small and weak due to a lack of Energon . This is how I reason that Earth machinery can come alive when the Allspark is triggered near it. The Allspark gives the machines the spark of life, an infusion of Energon. Then there is the issue of how all Earth machines turn evil, and how Optimus Prime can be descended from the other Primes. It's fairly simple, I think. The Allspark grants life. Another Transformer "bonds" a piece of their spark to the new Protoform, creating a form of parent-child connection. It instills the new Transformer with the essential knowledge of life and some basic personality traits from the parent, so effectively they emerge more or less fully grown. Optimus Prime is a descendant of the Primes because his line originated with one of the Primes sharing their spark with a Protoform, and so on, down the line. Earth machinery, as it is all derived from Megatron, has some trace amount of his personality in it, his hatred for the humans who kept him captive for so long, hence why all Earth machines that are activated by exposure to the Allspark first have the full knowledge of their weapons, and second have an overwhelming desire to use them on humans. This of course means the whole race is effectively genderless - which I feel is appropriate for a race of robots. The female Autobots simply are robots who happen to look female, rather than female robots. The descendant thing could also possibly explain why certain Decepticons have twins around - the ones who originated their line were great warriors, and judged worthy of imprinting on Protoforms, so that the Decepticons might produce more great warriors. Those less successful would not be granted such a right - ensuring by a twisted form of natural selection that the Decepticon forces remain strong.