The concept of "Fair Use" is well defined in United States (US) copyright law. It is a exception, (and limitation), to the exclusive right granted by copyright law to creative works. In the US fair use permits the limited use of copyrighted materials in instances such as commentary, criticism, parody, news reporting, research, search engines, teaching, library archiving and scholarship.
A person should always give the credit to the artist where it is due if they are either sharing it or even downloading it. The fact that fair use means that you can use it but some people will use and abuse that right a lot of the time because they will use it 50 times rather than 1.
I think copyrights are in place for reasons, I don't know how they can allow these infringements to be pushed on. If parody is aloud, think of Dumb Starbucks. It really should be aloud to be, it just takes a little push to stop these kinds of things from happening.
Even though the reason is fair still that is owner's right to get the benefit for his copyright. When some one is the creator of an album, or the author of a book that is his/her right to take advantage of the benefits involved related to that copyright, nevertheless, some individuals don't want to miss use or take advantage of that copy right, but still that is an extra usage without owner's permission.
No, fair use reasons do not give a person a legitimate right to bypass copyright protections, because fair use is something that happens within a copyright protection. When a person is using a work under fair use, they are doing so after they have paid for it. Bypassing copyright is unfair to those who created the work.