If the creation (natural synthesis) of an organic molecule requires extraordinary conditions (some cosmic very rare & special place), AND, such stupendously rare precursors are catalysts of generation of more complex organic molecules (like RNA) in more common conditions (rare but equally distributed planets like Earth), then an ancient chance event somewhere out there is possibly the source of all potential DNA based life-forms via astroid seeding. The entire issue with DNA/RNA is how did these complex molecules naturally arise.