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[Transformers] When and why did the Decepticons and Autobots split apart?

Why are there two separate factions of transformers? Have there always been, were they made/born separate or did they have a schism. Why do they have each of their philosophies? Why does Prime value all life, and why doesn't Megatron?
gpt
> Why are there two separate factions of transformers? Have there always been, were they made/born separate or did they have a schism.

They were created as two separate classes of robots- general retail services and military/security.

>  Why do they have each of their philosophies? 

One set was created to cooperate, emulate the needs of their customers, and provide for their safety and happiness. The other set was designed to follow mission parameters, respect rank and power, and to guarantee survival of their creators, whatever means necessary.

Autobots, the descendants of the retail class, seek to cooperate and protect creatures under their care. They want a peaceful happy interaction with any creature they meet and, if given a choice, will only act defensively.

Decepticons, the other class, are not concerned with any other creatures other than fellow Cybertronians, and not even those if they refuse to respect rank, orders and the superior ability of the most powerful of their class. The mission is simple: Create a peaceful, orderly, and secure existence for all Cybertronians under Decepticon rule.

> Why does Prime value all life, and why doesn't Megatron? 

Prime is an Autobot and therefore is programmed with the duty to cooperate, serve and protect. He seeks a voluntarily led society where every robot has a voice and a purpose, and none are disenfranchised. Other species are considered potential allies and peers to be respected and defended. To him, every life is valuable.

Megatron cares not for lesser lifeforms, being only concerned with how their exploitation can best serve Cybertronians. If it serves Cybertron and his rule for any being to live, then live they shall. If the alternative is the most effective path, then it is a necessary task that they die. Being inferior, their opinion in the matter is neither desired or even relevant. Only Cybertron and its future matters, and he is Cybertron's only hope at a future.