The default tab is the "Viewpoints" section that presents arguments about the topic, like the entry "Human Consumption of Animals is Immoral" from a 1999 Opposing Viewpoint Digest. More up-to-date materials are also available, like an item entitled "A Vegan Lifestyle Is Necessary to Stop the Mistreatment of Animals" by Bruce Friedrich, from Current Controversies: Rights of Animals, 2009.
And note those other colorful tabs above the results that lead to materials like "Reference Books," "Academic Journals" and "Statistics." For different topics you will find more or less material of various levels of usefulness at these other tabs.
Opposing Viewpoints Resource Center is just another tool for those interested in a pro-con debate-oriented presentation of social topics. CQ Researcher is another excellent source for both sides to key social issues. And a periodical available through Academic Search Complete, called Congressional Digest, is another very useful pro-con resource.
For more on Opposing Viewpoints Resource Center, you can take a look at some materials prepared by the publisher: An Overview Factsheet PDF, A Search Tips Guide, and A PowerPoint Demonstration of database use.