Dogs 'jumping up in greeting' constitutes a threat??

[Catherine]

The law should protect people, but it should not cater to their fears.
It is too vague a law to be enforced in a reasonable manner.

Most dogs jump up because they are glad to see us. I know they should be trained to control themselves, especially if the person is smaller, but you can only expect so much from a dog. We need to watch out for problem situations and prevent them. Even if we don't prevent all problems, people would be better to learn what is friendly behavior and what is threatening behavior.
That would be better than judging normal dog behavior as aggressive.
When a person finally meets an aggressive dog they will not recognize the danger.

I actually like it when dogs jump all over the place. It tells me that they are glad to see me. No one else jumps up and down when I come over.