Technically RIAA cannot take your private information. That is your own. Thus meaning that RIAA will become sued for the fact that they are invading someone's private property.
As mentioned earlier, the RIAA defends only the Recording Industry. Not the music artists, which are the losers same as the listener. The benefactor of the music media are the industries who produce the cds.
Now if they are threatening to take computers away, many of the public will retaliate with such an uproar. The thing is that people are sharing their music which they are NOT getting a cent back in sharing it. There is practically no profit, but a loss.
The RIAA will also have a hard time confiscating computers because that is your own property. Whatever is on the computer is intellectual property. Which is fairly easy to debate your use of "fair use". If they do do this, they will end up taking away school servers at many campuses across the United States where in student folders do contain mp3s, and other means of information such as programs. Then if they do this, the RIAA will be accused of obstructing education.
Also the RIAA is not being helpful to those that compose their own music, and have it distributed through these P2P networks. The artists will sue the RIAA for behaving recklessly and against the technology that enables unknown artists to get more user base.
The RIAA is NOT the police. It is a watchdog group which is only in the interests of their industry which will not figure out that using technology actually will help them succeed more. If they gave away music free, they could find other ways to reap in more money. Sell a brand of items for the artist, do touring which encourages a lot to attend.
The RIAA gets away with being the police is that they have strong lobbying power in Congress. But there is opposition in this ridiculous thing that the RIAA is doing.
Legislation is on its way folks to fix this.