Yup - though there are still safety problems, especially when it comes to inputs that might set off the trigger circuitry e.g. a lightning strike might have set

Yup - though there are still safety problems, especially when it comes to inputs that might set off the trigger circuitry e.g. a lightning strike might have set off some early weapons. See Eric Schlosser's Command and Control for a history of nuclear weapons safety. (BTW - even a fizzle can have the force of a pretty large conventional bomb. e.g. the first North Korean nuclear test, which probably fizzled, had a yield of something like 1kt TNT-equivalent, and the failed attempts to make a uranium hydride bombs still yielded something like 200t TNT-equivalent.)