I find it odd that all but a few of the people posting here, and most of the other people I've met who consider these questions, neglect
social change when they look at their society's pasts.
Let's think about someone who doesn't like integrated-circuit computer technology and who considers moving to the 1940's to get to a "simpler time". First of all, what don't they like about the technology, really? I'm willing to bet it's the commercial applications of and the cultural responses to that particular technology, perhaps the negative behaviors that surround the limited tools that the public has been offered. If that's the case, why not just change cultures instead of time-periods? Or why not change your own culture?
But even more than that, if the person in question does move to the 1940's (presumably the U.S.?) how would they handle the social conditions? Has nostalgia made us forget racial segregation, or the exclusion of Jews from many prestigious universities, or many other things? I expect that most people who consider moving into the past take for granted many of the social conditions of their home-era.
The social differences are usually more pronounced the farther back in time one goes. For example, do you want an agricultural republican idyll before the rise of industrialism? Try the U.S. around 1800. Just be careful that you are white, male, and own some property so that you can vote.
Love the Medieval European life and don't care about indoor plumbing? Okay, but you better accept monarchy, the power of the Church, and a feudal economy.
The question is not as simple as it seems. And I really think it's usually meant as a way to decry the lack of public control over what technologies are produced and produced in large quantities, and especially the apparent inability of our culture to find a way to digest these innovations in sociable ways.
(On this, I have seen better adaptations. For example, in Japan it is rude to speak (loudly, of course) into one's cellular telephone while riding public transit. So what do people do instead? They use text messaging, of course.

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