You cannot fail to communicate. The mind and the body affect each other. There is no failure, only feedback. People already have all the resources they need to succeed. Everyone is doing the very best they can with the resources they have available to them.
All meaning is context dependent.
Every behavior is useful in some context. Everything anyone does, even destructive things are for a positive intent. People work perfectly to accomplish what they are currently accomplishing. The real value of NLP is in assisting a person in formulating effective life strategies, communicating more effectively, and in creating and attaining achievable goals. Communication is the key to relationships.