this problem can be adressed with the integrated model of schizophrenia(howes and murray). They argued the early vulnerability factors (e.g. genes, birth complications, etc) together with significant social stressors (e.g. Social adversity), sensitises the dopamine system, causing it to increase the levels of dopamine. Biased cognitive processing of this increased dopamine activity results in paranoia and hallucinations, and eventually development of psychosis explaining how multiple factors can interact to cause the disorder which is more holistic and sufficient explanation