You are using the "I was at the train station and I was never mugged there, therefore mugging never happens at train stations" extrapolated argument.
People still think that smoking doesn't cause cancer, even when they are in the hospital because of not being able to breathe.
People still deny that climate change exists because of that one bought study in the 60s.
People still drink chlorified water and governments still are too lazy to use a biological cleaning process all over the world, even though it is proven that this increases cancer rates 2x as much.
As the devil's advocate I'd argue that people will only change their behaviour if a person within their personal influence radius dies because of it.
If they just read about it, they don't care.