Well, I don't think your instructor wanted you to follow Robert Capa's example literally. "Hmm, I might get my head shot off maybe I'll leave the Rolleflex in the landing craft"
Jnanian provides an excellent example of photographs that do not play it safe. I would do well to follow your instructor's advice. Though I am truly ashamed of the photos I took in high school photography, they never would have fortold my ongoing interest.
So even if you don't follow your instructor's advice, even if your photos from this class remain safe. It doesn't mean you won't have a future...