If this is a causal relationship, how can we explain the apparent heritability of schizophrenia? Some cursory Googling shows 79% heritability found in one Danis

If this is a causal relationship, how can we explain the apparent heritability of schizophrenia? Some cursory Googling shows 79% heritability found in one Danish study. https://www.healthline.com/health/is-schizophrenia-hereditary#schizophrenia-and-heredity https://www.healthline.com/health/is-schizophrenia-hereditar...