Any type of drug can trigger psychiatric problems, most often diagnosed as a 'temporary substance induced mood disorder', but also can trigger more permanent underlying disorders. Stimulants are notorious for that. Lysergic acids cause a 'natural', less forced type of stimulation which still causes sleeplessness and forces the mind to think about issues which can be traumatic. This is why responsible psychedelic users always consider psychological set and physical setting and ease themselves into an experience by taking gradual doses over the course of the experience.
But not every kind of drug triggers the same psychiatric disorders or at the same rate. Tranquilizers and sedatives do not trigger schizophreniform disorders as readily as hallucinogens and other stimulants do.
Researchers found out that schizophrenics who used hallucinogens were diagnosed younger than the general population of schizophrenics. This could have been because of early onset, or it could be that they were hospitalised for another related reason and consequently diagnosed earlier.
LSD psychotics had similar family histories as schizophrenics except that their parents were more likely alcoholics. They did remain clinically separable from schizophrenics. (1)
People now hypothesize that the LSD psychotics are schizophrenics, despite the fact that hundreds of patients were hospitalized, more than 1/3 for more than a cursory period, in a single hospital in a single year, as a result of taking LSD. (2) This cannot be explained as schizophrenia.
Researchers gave LSD to schizophrenics, who said it was not schizophrenia.
They gave it to monks who also said it was not enlightenment.
They gave it to criminals, who were not reformed by it.
Rather than being government propaganda amid hogwash, this is documented history and self reported experiences, psychiatric evaluations, and observations of family members, which gives rise to a generally accepted view.
Without a study on LSA this is merely guess-work based on how the drug feels. I would guess LSA is like LSD, a known cause of psychosis and not a trigger of schizophrenia.
A hypothesis can be made that because LSD feels better than LSA it is safer, but one could also hypothesize that feeling drugged is less likely to cause schizophreniform disorders. Just like being unaware you have been given a drug: hallucinogen, alcohol, marijuana, can cause a far more negative reactions than voluntarily taking the drug.
1) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1806863/?page=9
2) http://www.ncbi.nlm.nih.gov/pubmed/6870484
(other studies not referenced)