The Constitution doesn't say anything about a LOT of matters. But it does delegate authority to congress to make laws, the executive branch to enforce those laws, and a judiciary to determine whether they are allowable, when challenged.
I don't recall seeing anything in the Constitution about having to stop at a red light, but we are all ok with that. The logic that "it doesn't say anything in the Constitution about such and such..." is easily proven bogus in most cases.
Duck's point is right on. However, we should be careful in how we define "American culture", especially if we start legislating from such a position. There's not many things in the world as diverse as the American culture.