Earlier quoted context omitted.
If I put a hammer over your head that can fall any minute you'll be worrying, but if you're born with the hammer over your head and your parents before you as well, it becomes less of a thing.
On an individual level, we all have a variety of hammers over our heads. Cancer has killed far more people prematurely than nuclear weapons. Something like 500,000 people a year are murdered. Traffic/bicycle/pedestrian accidents also kill more than nuclear weapons. Even compared to a once-in-a-century nuclear war that perhaps kills a billion people, cancer will kill roughly a billion in the next century anyway. So, f…
Some of the hammers such as the hammer representing nuclear weapons - are caused by people and can be solved by people. There's a big game theoretic hill to climb over, but social pressure and advocacy have been effective at making progress. Others, like cancer and general senescence, are more of a looming threat that's a fundamental characteristic of biology, we can (and should) worry at them to make incremental progress but we're unlikely to suddenly eliminate them. The murder rate is enormously dependent on individual location and individual relationships. Traffic/bicycle/pedestrian accidents are enormously dependent on individual behavior.
Of those threats, addressing the problem of nuclear weapons - especially for a member of Nihon Hidankyo, with a personal and persuasive story of the damages these weapons caused - is probably near the top of the list for actions which can have the greatest positive change.