Where can I find some articles that argue for or against capital punishment?
The ideal place to find articles on this subject are the library's Hot Topics and News Databases. You can view them through the list below.
CQ Researcher, Facts on File : Issues & Controversies, and Gale : Opposing Viewpoints are all good places to find overviews of the topic, and the common arguments about it. Opposing Viewpoints also has numerous articles in which people argue specific positions about the issue.
There are also many articles about the issue in the EBSCO databases, which you can retrieve by searching for DE "CAPITAL punishment".