If we say that a T cannot terminate a client, that implies that the T owes more to their client than the actual terms of therapy, basically, indefinite availability and unconditional willingness to provide that client services. The T does not actually owe that to the client, and it is not included in the therapy fee, and there really is no way to guarantee such a thing, because it simply is not realistic. Also, for a T to provide services to a client they wished to not provide services to would make those services ineffective anyway and would further destabilize the relationship.
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It is not realistic to say that a T should be willing to, or even can work with all clients who behave in any manner. It is also not realistic that a T can continue indefinitely to work with a client that they once could work with, if the situation changes significantly enough to be such that the T does not think they can work with that client anymore.
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It would be impossible to create a kind of therapy in which a T never abandoned a client.