Why don't they remove negative hosts from the Trill symbiont like Joran?

Question

DS9 "Facets":

DAX: The zhian'tara is a ritual where joined Trills get a chance to actually meet their previous hosts.

KIRA: Meet them? How?

DAX: That's where you come in. If you don't mind, I'd like to borrow your bodies for a few hours.

O'BRIEN: What do you mean borrow our bodies?

DAX: If you agree to participate, the memories of one of my previous hosts will be temporarily removed from the symbiont and imprinted onto you. You essentially become one of my hosts for the duration of the ritual.

BASHIR: And how is this accomplished?

DAX: The memories are transferred telepathically by a Guardian.

I would think dying trill would be honored to do such a service to keep the symbionts purer and ethical, at least to some degree. It'd also give the ones who never got to host somebody a chance to join even if briefly with a negative host. They could set certain parameters like physical violence, murder, cruelty, rape, etc.

Wouldn't it be easy enough to transfer a negative host like Joran to a person who is on the verge of death to get rid of such a negative host who is a murderer?

Answer 1

That would probably have a negative effect on the Symbiont in the long run. If it was that simple to remove the essence of a previous host, that is probably what they would have done to Joran. They already went to a lot of trouble to cover him up.

Concealing the memories of Joran was traumatic enough to Dax to begin with. If that's the process they choose it was probably because it was the one that would cause the least damage to the symbiont.