You need to establish a goal, and the reason for the goal. An example is "Have my high school require everyone to take a course covering this syllabus in Euclidean geometry" for the goal, and "because it is intellectually enriching and potentially useful" as the reason.

I don't think the above is a good example. Here is a different example: "Require knowledge of Euclidean geometry and its applications to graduate from high school" as a goal, with the reason being "our society needs engineers, technicians, and other workers who will use the knowledge and applications to improve our community." I like this example a little better because the reason feels more concrete; sadly, I do not know if the reason is valid.

As your present question stands, I do not see a good combination of goal and reason. When you have that, you will have a foundation for arguing for your goal.

If the goal is to help students learn proofs, I might suggest looking at Common Core education standards happening in the United States. Good communication and expression in a broad range of areas of study is emphasized, and I would couple this with the ability to produce arguments in a variety of styles: logical, emotional, inspirational, to start. I would suggest a course or two which presents arguments in geometry, algebra, analysis, discrete mathematics, and logic, so that one can taste the different flavors of proof that occur in the fields.

Gerhard "Also Gives Fresh, Minty Breath" Paseman, 2013.12.19