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Perceptual psychologists ask, "What is it about this object that makes people want to use it this way?" The object must talk to us with some sort of language. If we can understand this language, then we can make tools that tell us how to use them! We can also make tools that recommend some uses, and discourage others.
"Discouraging" sounds sort of odd: Why would a tool let people do something, but then discourage people from doing so?
One reason might be "because we can't do anything about it!" You can throw just about any physical object, even if you don't intend people to.
Another reason might be "because some people will actually need to use it that way." If you have a fire alarm, you want people to be able to pull it. But you only want them to pull it if there's an actual emergency.