This simplistic view as a "property", which is a very familiar notion for most of us, confuses people into thinking that they could, and should be able to "own", for example, a joke, an idea for a business, or any kind of idea, the same way they can today own their car or their house.
The law is way more complicated than that, and by default, ideas can't be owned (and for that matter, can't be "stolen" either). I don't think we want this to change. However, it might be desirable to get this into peoples' mind.