Do you think that the police give the owner of a store filled with pirated DVDs a chance to make their case? No, they seize the stolen property and close the store.
> Our culture is richer because whole genres of music and other creative arts have at times ignored the rules against sampling, collage, and other reuse.
You seem to be picking and choosing here. The subjects of these domain name seizures weren't using this stuff in a fair use manner, they were straight up distributing (and profiting from, through ads) stolen goods and selling counterfeit goods. Our culture isn't being made richer by someone selling counterfeit purses or helping people steal movies, TV shows, and video games.
It's easy to make these statements in vague terms, but imagine if you were an iPhone game developer whose $2 game was being distributed to tens of thousands of people by piracy networks, hurting your already lower-middle-class income. Do you think that's making our culture richer?