I'm sorry, but if you want to be butthurt about Judith Butler, can you do so in a PM or something? I'm trying to have a conversation here.
Argh, this is a very frustratingly confusing topic. I think the best way of explaining what I'm getting caught up with the most is that, perhaps, the Realist is correct because properties are like the "life" of an object. I think actually a better question instead of asking what makes things similar is what makes things different. The nominalist would answer that what differs is the material structure of the particular, like the atomic structure, or the string/quantum foam/etc structure. But this begs to question as to why these different structures give rise to different properties. — darthbarracuda
Whichever question is better, there's nothing to stop me from asking, "What makes them the same?" And so I will:
why are two tropes similar? If A and B are resembling tropes, but C is not a resembling trope to either, then why is that?
And what's a structure? Because if two objects can have the "same" structure, then you're appealing to universals again. Ditto for the "brain-interpretation" counter, which seems to be positively
full of holes. Is the brain doing the
same interpretation over and over? And even if red is "just" an experience, is it the
same experience over and over?
That's the problem with the nominalist response that appeals to "brains" or "minds" in order to try and get away from realism. All such responses operate on an implicit dualism that assumes that, if something is "in the mind," then it's safely cordoned off from the rest of the world. If abstractions can exist in my mind, but not in the rest of the world, then you need a good reason why they can only live in my mind. I don't think that minds are particularly unique "metaphysical ecosystems," if you get my drift.
Same for "names." Let's say that every name is an action rather than a universal. So what? The question then arises: if I say "Bob" twice, then
in what sense did I say the same thing twice?
That's the central problem: if nominalism were true, then I'd expect my experience of things to be a completely chaotic flux of absolute randomness with no identifiable patterns whatsoever, because as soon as identifiable patterns crop up, universals have already snuck back in. But experience is not a chaotic flux of absolute randomness.
Nominalists aren't stupid. They've come up with countless clever answers to how things are the way they are without universals. But all of those clever answers seem to be susceptible to different forms of the same problem. Perhaps the problem is universal.
;)
Your penultimate paragraph, by the way, beautifully summarizes the motive behind nominalism:
Additionally, I fail to understand how we can come to understand such things as "abstract" objects. To be perfectly honest they simply come across as spooky, superstitious ghosts. — darthbarracuda
The main counter to this is that, if abstractions are spooky, superstitious ghosts, then the nominalist is just as haunted as the realist; every time the nominalist banishes a ghost out the front door, another one slips in the back.
Moreover, what
isn't a spooky, superstitious ghost? In recent times, you see, we have learned that the ordinary, solid matter that we see around us is made up, at the smallest scales, of really weird stuff that isn't anything like our commonsense notion of matter. And yet, the nominalist wants to appeal to that commonsense notion in order to get rid of universals.
I'll address the third man argument, as well as your last paragraph, later, because they're both almost worthy of threads in themselves.