I understand your point, but suing your clients is not a good marketing plan.
:)
A bad client is not one I intend to continue to engage. You seem to take the side that a client is always good but those of us in the consulting world know there are simply companies and individuals never to engage.
The OP described such a client: The client doesn’t want to continue the business relationship but wants the OP to assist the client terminating the relationship. The OP is under no obligation to do so. The client claims purpose of self sufficiency, however, it is often a ruse to take the work to a competitor. The OP is under no obligation to assist a competitor, either.