I think it is best to write the thesis statement AFTER you have written a few paragraphs about your selected articles.
When you read an article, write a paragraph about the message it sends. When you read another article, do the same.
Soon, you will notice your own unique message (thesis statement). But with this particular project, you have a strange requirement: to write about both recreational and performance enhancing drugs... these raise entirely different moral questions.
What does an athlete's use of rec. drugs have in common with her use of performance enhancing drugs?
