You may be missing the forest for the trees; the worrying aspect is not about whether subcritical tests have taken place in controlled environments and been carried out by skilled and talented individuals. What makes everyone nervous is that a tyrannical equine [0] and its ponies are champing at the bit to make use of nuclear weapons as a way to pressure detracting countries that are resistant to fascism and to control the world.

[0]: https://youtu.be/JhkZMxgPxXU