"People Are Not Dysfunctional – Social Systems Are"

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functional[ fuhngk-shuh-nl ]
adjective
of or relating to a function or functions:
functional difficulties in the administration.
capable of operating or functioning:
When will the ventilating system be functional again?
having or serving a utilitarian purpose; capable of serving the purpose for which it was designed.
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Presuming "dysfunctional" to mean "not functional"...

...in order to decide whether or not people are "dysfunctional", wouldn't one need to know what their purpose is?

What is your purpose?