Yes, one reason I chose to compare suicidal depression to cancer is exactly that both are partly genetic (especially early in life) and partly have environmental risk factors, which typically take years to come to fruition.

I would not be surprised if suicide rate is affected by sexual abuse in childhood, or random acts of violence, or drug abuse in the home with the randomized behavior that typically follows from that. When kids are small, the brain is still developing its basic structures. But that's completely different from "parents need to align their views on sexual morality with that of their child".