In their hearts and from their life experience, people really do understand the difference between Inclusion and Exclusion. They just need to be reminded of what they already know. The responses are universal. When people are excluded, they feel 'bad'. Inclusion is the precondition for learning, happiness - for healthy living.
Exclusion is the precondition for misery, loneliness and trouble.
We know teenagers often choose to die - rather than be alone. Belonging is NOT incidental - it is primary to our existence. Inclusion is the foundation of the house. It is not a guarantee, but rather a precondition for the growth and development of full and healthy human beings. Dictionaries also help.