The details/articles hosted on Wikipedia has been incorporated in Wikipedia is true. I think you did not noticed the same wikipedia which clearly states ''Edit'' and ''citation needed''. The Wikipedia is ready to amend or to incorporate the true details if given with authority. Therefore, Wikipedia says the words 'Edit' and 'Citation needed'. The articles hosted on this site are released by and can be edited by anybody who has a user id on Wikipedia.
Who is responsible for the articles on Wikipedia?
You are! Actually, you could even edit this very FAQ, so long as each edit is helpful. This is a collaborative effort. Millions of people have contributed information to different parts of this project, and anyone can do so, including you. All you need is to know how to edit a page, and have some encyclopedic knowledge, which you would like to share. The encyclopedia provides users with a certain amount of freedom.
You can learn who is responsible for the most recent versions of any given page by clicking on the "Page history" link. Nevertheless, if you spot an error in the latest revision of an article, you are highly encouraged to be bold and correct it. This practice is one of the basic review mechanisms that maintains the reliability of the encyclopedia. As a result, Wikipedia has become one of the most extensive information libraries available on the Internet.
If you are uncertain, or find the wording confusing, quote the material on the associated talk page and leave a question for the next person. This helps reduce errors, inaccuracies, or misleading wording more quickly and is highly appreciated by the community itself.