Yeah, just like assuming the "big bang" actually happened is foolish because even though evidence points to it being the most likely thing to happen, since we're not 100% sure. We shouldn't assume it. Many genecists would disagree with you on your interpretation of Y-Adam and most all would tell you he almost necessarily would have to have more than 2 kids. That is a near-impossibility. Much of science, and especially anthropology of pre-historic societies is based on the assumption of what is most likely to happen. If choice A is 99% likely to happen and choice B is 1% likely to happen, scientists are logically going to assume choice 1 and do subsequent work based on the assumption that choice A is true. Science is based just as much on logical deductions as factual evidence.
One problem: we have
no idea what the chances involved are, nor, given that the determination of Y-Adam is not generated by a single individual but by
thousands upon thousands of individuals, are those particular chances of much relevance. The creation of Y-Adam is not immediate, but retroactive, something that happens millennia after "Adam" himself is long dead. His own participation is fairly minimal.
Honestly, you attach
far too much importance to the notion of Y-Chromosome Adam. His title is one gained through sheer chance, he is not some sort of hypermasculine demigod.
Get over it.
No, but supercharning "superior" individuals is good for the species as a whole.
And why would anybody care about the species? You're arguing that humans are, by nature, psychotically individualistic, so why should they pledge their loyalty to such a grand abstract as "species"?
And also fear and subjugation would keep a rigid social structure in order.
Rigid enough for formalised socio-economic classes to emerge in a simple, instant-return hunter-gatherer society? I think you are being overly fanciful.
Dominance and submission is very apparent throughout most species, not just humans. We are not somehow above this rule. When a group of boys get together, there is usually 1 or 2 that become the "alpha" males and the rest of the group follows generally whatever they say. Most humans are sheep that follow with a few who have the personality to lead. That should be pretty apparent in today's society.
Well, the puerile over-simplifications that drip from every single letter of this paragraph aside, that doesn't really answer my question. All you've asserted is that hierarchies naturally form, not that they are unerringly passed down through the generations in the absence of social constructs which assure that they do.