Warfare can and will kill many, but the rich are generally the least likely to die, because they are the most mobile and can afford the best defense.
No, they aren't. Where'd you get this crazy idea? Car accidents alone are the largest killer of younger people in the US. 30,000 people every year die in the US alone in cars.
Here's a list of leading causes of death from the CDC: https://www.cdc.gov/nchs/fastats/leading-causes-of-death.htm
Accidents is #3, at 170,000 people per year.
>and can be decreased further with lifestyle choices that reduce such risks.
So what? What makes you think people are going to do that? They aren't doing it now; they're happily taking up stuff like vaping, which is now killing people and is all over the news.