To keep it simple, "Do unto others as you'd have done unto you."
With that being said, a binding spell imposes upon the free will of another by restricting their actions directly. This could be to bind them to keep them away from someone or to stop a specific behavior.
If you are in a situation that you feel another person's physical or mental actions are attacking you, you can do PROTECTION SPELLS for yourself to protect you from that person (plus at the same time, other random negative events as well) and not impose directly upon another person's free will whether you think they deserve it or not.
First rule of a Wiccan, the Wiccan Rede, "Do as yea will, HARM NONE." That includes yourself... Imposing on another person's free will is just looking for a Karma kickback. What you send out comes back to you times three (or until you learn your lesson).
And if you don't believe your actions have consequences, then you don't need to meddle in magic.
The exception to the Binding "Harm None" rule is if the person you need to bind is requesting you to stop them from doing something. When you have their permission, you are respecting their free will.
I have performed binding spells on myself to stop bad habits and I have done this for friends as well who wanted to stop negative behavior when I had their permission to do so.