Is it genetics? Is it Fate? Why don't we know?

After all the research, why are we no closer to finding out? I am sick of reading conflicting reports on what it could be? Each year another report that totally disagree with last great revaluation. One in four is that magic number, 1 in 4 lost tomorrows, only sorrows and tears for our futures. Looking back on my family ancestry, my mother had 10 brothers and sisters but only 3 of them serviced into adulthood, my father also lost his brother in childhood