The functional difference between 'causes schizophrenia' and 'triggers latent schizophrenia' to someone who is diagnosed with schizophrenia after ingesting ayahuasca is practically non-existent.
Sure, you can generalize that those with family members who have schizophrenia are at an increased risk of having it rear its head. However, not everyone with schizophrenia gets diagnosed nor do many people have detailed psychiatric evaluations of their relatives to make decisions off of.
I would agree with you if there are people with 'latent schizophrenia' that would never have it become active but for the drug use. But perhaps it's more like someone with a heart defect that dies after some physical exercise -- there was a latent defect that would have revealed itself sooner or later (and schizophrenia is generally diagnosed by one's mid to late 20's). Does the literature have a consensus on which is the case?
Presumably the person with latent schizophrenia would see it emerge at later date even if they didn't take psychedelics. If the drug is only making symptoms emerge earlier, the cost of the trip is only however many years of sanity you had left (say, 5) rather than a lifetime of sanity (~65 years).
My understanding is that 'latent schizophrenia' is a term referring to the predisposition towards developing schizophrenia if certain environmental, social or other stressors trigger it.
It may never truly manifest itself as schizophrenia because of the lack of non-genetic factors involved in the illness.
The nature of schizophrenia isn't that genetics will absolutely determine whether or not someone will develop the disease. One can be diagnosed with prodromal schizophrenia and, with proper intervention, will never be diagnosed as schizophrenic or experience those symptoms again.
To say that the drugs will make symptoms emerge earlier instead of later in life isn't entirely accurate. Those symptoms may _never_ emerge at all, given the right circumstances.
It seems that the 'right circumstances' for those with a predisposition towards developing schizophrenia include never ingesting certain types of drugs.
Sure, you can generalize that those with family members who have schizophrenia are at an increased risk of having it rear its head. However, not everyone with schizophrenia gets diagnosed nor do many people have detailed psychiatric evaluations of their relatives to make decisions off of.