Wikipedia:Welcome unregistered editing
Editing is a blessing to Wikipedia
The source of edits concerns Wikipedia only in terms of how it affects their quality and their legal status; therefore, unregistered editing should be encouraged whether done by newcomers, or by even old hands wishing a return for renewal of the prime unregistered editor experience.
Restricting individuals' unregistered edits should be a last resort
Even those who have transgressed should be welcome to edit as an unregistered user, so long as they are able to do so civilly. The sanction of withdrawing such ability to contribute should only be enacted when the person has not responded to milder forms of rebuke and restriction of privileges. Even then it should always be limited in time.