Everthing causes cancer

You've heard it said. You probably said it yourself. Heck, I've said it numerous times. It really does seem as if everything causes cancer!
So, why then would I put so much care and research into living a natural lifestyle if I could possibly end up with cancer anyhow?
"You can live on bland food so as to avoid an ulcer, drink no tea, coffee or other stimulants in the name of health, go to bed early, stay away from night life, avoid all controversial subjects so as to never give offense, mind your own business, avoid involvement in other people's problems, spend money only on necessities and save all you can. You can still break your neck in the bathtub and it will serve you right." Eileen Guder
If this is so, then what's the point of trying to be safe? In my very simple way of thinking, I say "Yes, this is true. But God also gives us the knowledge, common sense (some of us) and resources to avoid stepping on the soap on the way into the bathtub."