The End-Users
would want to easy and full access to the registrant info. That is only
when they want to know who sent an e-mail or who owns the web site.
There exist multiple examples of life outside the ICANN bubble where access to ownership information is neither publicly accessible nor completely inaccessible in cases of abuse or other objectionable activity. License plates on autos are a clear example. If you spot someone driving dangerously on the road you don't have access to the details of the car's owner but LEA does, and they can access it even before a law is deemed to be broken.
Users of the road are not clamouring for better access to vehicle data; in most countries the system works. I don't see demands for Internet ownership info that would exceed demands for car or other ownership data.
Many other examples exist. Domain space -- and indeed the Internet -- does not lie outside public norms elsewhere.
- Evan