You are an optimist. We only need one mistake for things to get out of control. The history of known close calls is eye opening[1]. Similarly with this particular China example, it only takes one person to make a miscalculation.
I'm a realist. This list proofes that people are not as stupid as alarmists make them. At the end of the line, there are always people asking the relevant questions, because it's their f*ing job to do that.
1. https://en.wikipedia.org/wiki/List_of_nuclear_close_calls