Wikipedia has always been deliberately inclusionist and eventualist in its attitude to articles. If a subject is theoretically capable of being written about in a verifiable, neutral manner, no matter how poor or biased the article currently is, or may be in the future, we retain it in the hope that it will eventually be improved: a bad article is a "work in progress". This is represented by demanding a positive consensus that an article requires deletion before removing it.
Wikipedia has for some time accepted that biographies of living people require special treatment. In these cases an important rule of thumb is "do no harm". Whereas unsourced material in other articles may simply be tagged as requiring verification, unsourced material which may cause harm is to be ruthlessly removed. Wikipedia has a duty to treat biographies of living people with special care to avoid harm to the subject.
We now also require a positive consensus at deletion review before undeleting any article deleted under the BLP policy.
Low notability biographies present Wikipedia with a particular problem.
a) Whereas other articles may at times exist in a biased state or include false claims, and "eventually" be fixed. Problematic biographical articles can be doing real and immediate harm to the subject. It isn't acceptable to think in terms of eventualism.
b) Wikipedia's theory is that articles reach and maintain neutrality and accuracy through a process where a wide number of editors work on them. (If someone edits Scientology in a biased way, there are plenty of people ready to revert or improve – and they won't all despise Scientology). Knowledgeable people will look at articles, and even non-apparent falsehoods will be spotted.
Whilst many Wikipedians do not believe that we should automatically delete an article out of consideration to the views or interests of the subject, administrators may consider that it is irresponsible to simply default to keep in the case of low-notability biographies.
In cases where there is a reasonable belief that the article may cause distress to the subject or, due to a lack of interest, there may well be problems in maintaining the article in a fair and accurate state, administrators may wish to require a positive consensus that Wikipedia requires to retain the article. In short, in the absence of consensus to retain, Wikipedia may be best served by defaulting to delete the article (or relist where participation has been low).