Genre

Both the Political cartoon and the Magazine ad’s arguments change because of their respective genre. The most important part of their genre is whom they are trying to influence.
The political cartoon is in the opinion section of the paper so it doesn’t need all the evidence that an article in the other sections of the paper would require. It also allows the author of the cartoon to include more of his own opinion in the piece. Because the cartoon is only one frame long, its argument pulls more at the heartstrings of the reader than the reader’s analytical side. The obviously starving African pitted against the anti-genetics hippie. This is a gross generalization, but because of the piece’s location, it serves as an effective argument.
The Magazine ad is located in a pro-health magazine, where’s it audience is most likely already anti-genetics. This allows the article to only publish evidence for its side of the story because the audience isn’t looking for a well-balanced article. Instead the ad can present its point of view in a very biased fashion.