Q. why should i be a vegan?

To be a vegan or not is an individual choice.  The choice may be guided by the information that you find through information obtained by conversation, media, books, articles, and more.  A good start for your research is a database called "Opposing Viewpoints"  Type in your topic, and you will find a list of viewpoints, articles, and more.  Another database to try is called Academic Search Complete.  A quick way to access these databases by name is through "Search Seton Hall" box in the upper right corner of most shu.edu pages.