If the page redirect titles exist in Wikipedia, they are valid in Wikidata as data, regardless of what they represent in your view of "quality".  If cleanup needs to be done, it should be done in the context of the source first.  Evaluating the value of a specific "alias" to a Wikidata item is a judgment that should be based entirely on a referenceable data source. 

Wikidata aliases (as well as descriptions and preferred labels) are completely arbitrary and unreferenced, and in my judgment worthless, without a primary source or clearly defined semantic relationship. The judgmental curation of Wikidata is in fact, not that useful.  Wikidata should simply seek to represent data as it exists (errors or not) in the primary source. 

Furthermore, apparently you do not get why skos:hiddenLabel exists.  Why you feel that it is not worthwhile is not relevant to its primary function, which is to facilitate searching. (see https://www.w3.org/2012/09/odrl/semantic/draft/doco/skos_hiddenLabel.html)

 And, it is not difficult to argue that the searching in Wikidata could use improvement.  

On 16 March 2016 at 13:00, <wikidata-tech-request@lists.wikimedia.org> wrote:
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Today's Topics:

   1. Re: Wikipedia Page Redirect Titles in Wikidata (Lydia Pintscher)


Message: 1
Date: Tue, 15 Mar 2016 16:49:40 +0000
From: Lydia Pintscher <Lydia.Pintscher@wikimedia.de>
To: wikidata-tech@lists.wikimedia.org
Subject: Re: [Wikidata-tech] Wikipedia Page Redirect Titles in
Content-Type: text/plain; charset="utf-8"

On Sat, Mar 12, 2016 at 2:14 PM Christopher Johnson <
christopher.johnson@wikimedia.de> wrote:

> Hi,
> I am developing a scientific terms thesaurus and have discovered that
> existing Wikipedia "page redirect titles" provide a useful way to resolve
> an odd or archaic form to a "canonical" term label as it is represented by
> the Wikipedia page title (aka Wikidata "sitelink").  For example,
> https://en.wikipedia.org//w/api.php?action=query&format=xml&prop=redirects&titles=universe
> In Wikidata, these "page redirect titles" are not represented in the data
> model except very inconsistently and sparsely as skos:altLabel or
> ("alias").  My use case is that I would like to be able to query Wikidata
> for these page redirect titles in order to resolve odd multi-linguistic
> names to an single concept.
> My question is that if I were to create a bot that imported all "page
> redirect titles" for a given sitelink and created them with the
> skos:altLabel property en masse, is this a valid semantic relationship?
> Or, should it rather be represented as ?sitelink owl:sameAs <page redirect
> URI>?  Or both?
> Furthermore,, in some cases (z.B. mis-spellings), skos:hiddenLabel may be
> more appropriate, but this has no definition in the data model.  There
> potentially would be a lot of clutter in the UI without a hiddelLabel alias
> property.  Also, there are no types for page redirects in Wikipedia, afaik.
> Additional value for the searching in the WIkidata UI could probably be
> obtained from indexing these alternate page titles as well.

There are several points to address:
1) Should redirects from Wikipedia be imported as aliases on Wikidata? No.
This has been done before and created a massive amount of cleanup work
because the redirects contained a lot of not meaningful misspellings and
more. Please do not import them to Wikidata without approval through the
bot approval process and clear quality control.
2) Should we allow more fine-grained distinction between real aliases and
misspellings in the UI and datamodel? No. I don't believe this is worth the
complexity and resulting discussions/edit wars and more.

Lydia Pintscher - http://about.me/lydia.pintscher
Product Manager for Wikidata

Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin

Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.

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