Your definiton of “valid” is completely meaningless, and so was your arguement about the “validity” of moral nihilism. As a result, everything posted since this first post of yours, is completely meaningless also.
Its not meaningless, it has a clear and unambigious meaning, which has been posted several times in this thread. Rand arguing the semantics of ‘selfish’ was completely different, since her point was that the word ‘selfish’ referenced a hodgepodge of distinct and unrelated concepts without any clear unity, hence making the concept of ‘selfishness’ (in standard usage) invalid.
I would agree that this thread has deteroriated rapidly since my first post though.
Look, I can see where you’re coming from. But there’s a limit to how far one ought to go in accepting stipulated definitions. (In fact, I think they’re half the reason that a lot of contemporary philosophy is practically unreadable by anyone who is not a trained scholar.).
Most advanced fields of study generally evolves its own vocabulary over time. I agree that modern philosophy does tend to take this a bit too far, however you have to realise that someone who hasnt studied philosophy for a significant period of time simply isnt meant to be reading academic journals, any more than a non physicist should be reading peer reviewed journals on quantum physics. Academics generally write for other academics, who they assume are familiar with the problems tackled and terminology used. When academic philosophers write for the general public, the terminology is (normally) toned down to an understandable level (or introduced gradually).
On a sidenote, even Objectivism (to a lesser extent) has its own non-standard approaches/phrases/nomenclature which an outsider would find completely baffling. A newcomer attending something like the TOC’s ‘advanced seminars on objectivism’ would probably be almost as baffled as a non-philosophy student trying to make sense of kripke’s rigid designators, or whatever.
I don’t know that this is how “valid” came to have the meaning it has with respect to logic, but it’s had a similar effect. If it were called “formally proper” or something like that, people wouldn’t think of valid but unsound arguments as being half as important as they do. The focus might well be more on connections to reality, rather than connections between concepts.
Have you considered that the term ‘valid’ might actually have been initially created to describe ‘sound’ logical arguments, and then filtered down into common usage from there? I dont know personally, I’ve no idea if the term ‘valid’ was co-opted from general usage by logicians, or vice versa. Personally when I hear the word valid, I normally assume its being used in its logical sense.
If you want proof of this, go talk to some Freshman in a logic class.
I really dislike hit and run attacks like this. If you think that formal logic is somehow fllawed (I think thats what you were getting at, although I could be wrong), I’d be interested in hearing why.