IDK, I think finding a related cause would be reassuring. If you start seeing multiple sequential unrelated failures in a system you usually conclude the root cause is systemic.
Now if two F/A-18s crashed, that's more suspicious and could indicate a systemic issue in F/A-18 maintenance or operations. But there's a large difference between a helo and a fighter. Different parts, different maintenance procedures.
Overworked crews make mistakes; it happens. But when sailors decide a ship is unlucky, things get really bad.