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Science, as a profession and as a culture, has a problem. And scientists everywhere ought to be embarrassed by that.
While there are definitely observable fetish aspects to the celebration of youth in our current culture, we no longer marry immediately post-pubescent because, for the very most part, we no longer need to as a practical necessity to be able to have family or an otherwise "full life".
You assumptions on economics are so bad they border on ridiculous. Up until the 1920s, 30 percent or more of the US population were farmers: http://www.pbs.org/wgbh/amex/t... And yes, as the percentage of workers in agriculture declined, those in manufacturing rose; however, the real economic differentiator remains education, and that trend has only been slowly improving: http://en.wikipedia.org/wiki/E...
Or, if you require a religious analogy, if worship is an act of volition (i.e., you have to chose to worship God), then approval also has to be an act of volition; as opposed to tolerance, which simply involves a choice to ignore behavior that doesn't otherwise interfere with your personal choices. Or do you not believe in or not understand free will?
If we ever get to the point where there are self-aware machines, it is infinitely more likely they will be borg-like with a collective consciousness than not, which means no one machine needs to "know" or be able to "remember" everything, just to know where in the network to access the knowledge repository.
And saying "only natural" about artificial constructs completely invalidates your conclusion, as does thinking humans optimize. People, in general, follow the path of least resistance. See my first sentence above for why.
Individual states weighing in on bitcoin doesn't make it any more or any less valid or relevant in the market. When the IRS, SEC, and US Treasury finally make definitive policy statements specifically mentioning bitcoin, then you'll have your validity, or invalidity, as the case may be.