I'd like to think of myself as a rational person, yet I worry about it. Because it's not just a matter of math; the effects of a billion people dying at once would be far more detrimental than the deaths from cancer over a century.
(One might think this line of reasoning that some people apply is a coping mechanism to ignore the reality, but that might be a different conversation)
But it is not just about coping. We as society, can make policies to decrease chance of getting a cancer and decrease traffic deaths. We just chose not to out of convenience and profit.