" 
 ::::: changes in case for consistency are a standard action in publishing and citation. I have a paper of mine that is being published in a journal and a textbook this year. If the journal uses APA style, I'd be expected to reformat my paper to comply with that scheme, which uses sentence case for headlines/article titles. If the textbook uses Chicago style, I'd be expected to reformat my paper to comply with that manual, which uses title case. Our MOS values intra-article consistency in allowing the editors of an article to choose a specific style of citations for use in that article. Our MOS has various instructions that we should alter punctuation and capitalization in a number of situations to match the our MOS and the style of formatting in an article. Just as APA would tell you to change the case style of a journal article when it's being cited in your paper, you can do the same in your Wikipedia article because you're not altering the meaning, just the formatting, of the headline.    "