The issue is quite hot: many registries publish, either via whois or with a Web page, informations about the registrants. This information can be used by spammers or stalkers. But not publishing them allow other unlawful usages. And this information is very useful to debug problems. One possible way out of this dilemna is to understand that you can publish some information but not all. For instance : Publishing data only for active domains, not for reserved ones, Publishing only the name of the registrant, forcing to use the contacts to... contact.