Its not difficult, Bret. The only issue is convincing ICANN/Registries/Registrars that it's important to take that view and make it so. If the data is kept private, the registrars would of course still be able to contact their customers and 'law enforcement' would still be able to issue warrants to obtain that data.
To jump on the bandwagon, in the post 9-11 era, it is much easier for law enforcement and such to obtain warrants and data as they no longer have to prove anything, rather just make a request.
Of course there will still be abuses. Registrants that want to hide will still give false data, law enforcement will still be wrong half the time, and the real thieves will still hack into the systems and steal the data. But at least it won't be readily available to everyone for global abuse.
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RJGlass
A@L
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AmericaAtLarge.org
RJPacific.com
DDMF.org