Facts:
Hull loss rate (through 2019) for the 737NG series: 0.18/million departures. For the A320 series: 0.18/million departures.
Fatal hull loss rate (again through 2019) for the 737NG series: 0.08/million departures. For the A320 series: 0.08/million departures.
Now explain to me how the 737 is an unsafe design compared to the A320 series...