But that leaves something out. I read Descartes and doubted everything but my mind, but I did not become a solipsist. (Solipsism, like homosexuality, can seem awfully tempting to people who'd be terribly disappointed if they actually tried it.) I decided that the possibility of everything out there being run by a single entity seemed less plausible than other apparent people actually being people, like me, with rich internal lives. I believe that you are trapped in a body, which in turn is trapped in an environment and a society. I like that; it means I'm not alone in a material world I find simultaneously scary and boring.
Of course there is a world out there, and we are supposed to believe in the objective view, or as Thomas Nagel calls it, the view from nowhere. The problem with the view from nowhere is that nobody has it. We are always imagining, approximating, hypothesizing, drawing distinctions and hoping that they work.
We have to keep doing it, though, because we are living in a set of prisoner's dilemmas: There are externalities, and the Market isn't going to resolve them for us, any more than God or the Dialectic will. We as a society must offer knowledge to everyone because we don't know who'll be able to use it for everyone's benefit. (Race and sex are really bad guesses.) It would be cheering to think that the antivaxxers were all morons brainwashed by Fox News, but it turns out a lot of them merely haven't figured out that it's an externality too. And I think I figured out why so many other people like the sci-fi fantasy of flying cars: They haven't realized that everybody would have them.