At RfD one of the perennial reasons given for deleting redirects is "maintenance". In fact most redirects require minimal manual maintenance, and as we get better at it, less still.
For example Hacoversine. This redirect sat there, requiring no maintenance for 9 years. I just received a message to say the page was patrolled today (2015-10-15). The only reason it was edited was to allow the concept to be added to Wikidata - which would not apply to most of the redirects at RfD.
Note, this is a random sampling of errors, vandalism and hoaxes, some spotted by me, some by others. The point is to remind us that Wikipedia vandalism is not "all corrected within a few minutes" as we sometimes seem to think.
34 children for two years - then they all left at the same time.
The Protestant Cruse family was made Jewish for two-and-a-half years, from the article's creation in April 2009 to October 2011. Based on the false information on Wikipedia, family members were listed on an antisemitic website.
These clumsy acts of vandalism. Just under three years.
I have also disambiguated "British" (several times), please correct any mistakes you come across. See User:Rich Farmbrough/Disambig scripts for a tool I used to help with disambiguation.
I would like to be writing great articles, but actually I'm an inveterate "fixer" of anything that I see that looks wrong - mainly links and copyedits. I have spent some time on GFDLing about 3000 images, and on some specific articles, for example Spaghetti House siege and Pedro Lopez. I also migrated a fair few biographies from DNB.
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