I don't understand, can you rephrase this?
Sounds to me like PrawnOfFate is saying that any sufficiently rational cognitive system will converge on a certain set of ethical goals as a consequence of its structure, i.e. that (human-style) ethics is a property that reliably emerges in anything capable of reason.
I'd say the existence of sociopathy among humans provides a pretty good counterargument to this (sociopaths can be pretty good at accomplishing their goals, so the pathology doesn't seem to be indicative of a flawed rationality), but at least the argument doesn't rely on counting fundamental particles of morality or something.
Since no claim has a probability of 1.0, I only need to argue that a clear majority of rational minds converge.
A few notes about the site mechanics
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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.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
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.