system
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human
[Firefly] Question about the Reavers, how do they multiply? Or propagate? Is there a 'government'/hierarchy?

It was explained in the movie that the Reavers were the 10% of humans that had side effects to the drug. Eventually, they killed everyone off on the planet. So a couple of questions:

1. How did they get from being the only *savages* on the planet to operate space ships and roam the galaxy?

2. After roaming the galaxy, how did they multiply if they killed and mutilated all of their victims? 

3. And after becoming a reaver, how do they become co-ordinated? IIRC, the movie explained that the reavers had higher amounts of testosterone which then turned them into savaged-like people. So if they were savages, would they have a leader (as the best savage)?
gpt
First, the reavers' starting numbers were a tenth of a percent - not ten percent - of the total population of Miranda. Those numbers are very different.

Second, it's a matter of conjecture as to how the reavers propagate and arrange themselves in society. Based on their activities and observed behavior, it's likely that they retain most of their higher-thinking skills, since they casually plot and pursue courses along the outer rim and don't prey upon themselves.

We've witnessed one specific case of reavers leaving behind a single survivor in order to corrupt him to the point of unhinging his mind. It worked. So it's also possible that they leave *many* of their victims alive, but only a single one behind as a calling-card for others in the system.

If they can do all that, surely they can breed amongst themselves.