Frankly; I would write a paper exposing the "Plant cruelty in the food industry." How dare your teacher attempt to indoctrinate the class into his/her political beleifs with a thinly veiled "paper". Has this teacher had the class write other papers like "Christian ignorance in the face of science" or "How minorities provoke racism"...? Wow! Just because some people, (even a majority) believe in a controversial view point, they have no right to promote it in a school.
Animal cruelty is claimed to be taking place in food business since the demand of animal products is high. Snacks offered on fast food joints are high in demand and at a closer look, the snacks require animal products if not the animal itself.