Imagine a mirror world, inhabited by our "evil" (from our perspective) twins. Now they all go around being all unethical, yet believing themselves to act ethically. They have the same model of physics, the same technological capabilities, they'd just be mistaken about being ethical.
Okay, let's try to figure out how that would work. A world where preferences are the same (e.g. everyone wants to live as long as possible, and wants other people to live as well), but the ethics are reversed (saving lives is considered morally wrong, murdering other people at random is morally right)
Don't you see an obvious asymmetry here between their world and ours? Their so-called ethics about murder (murder=good) would end up harming their preferences, in a way that our ethics about murder (murder=bad) does not?
So is it a component of the "correct" ethical preferences that they satisfy the preferences of others? It seems this way since you use this to hold "our" ethics about murder over those of the mirror world (In actuality there'd be vast swaths of peaceful coexistence in the mirror world, e.g. in Ruanda).
But hold on, our ethical preferences aren't designed to maximize other sapients' preferences. Wouldn't it be more ethical still to not want anything for yourself, or to be happy to just stare at the sea floor, and orient those around you t...
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A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
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Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.