>Should we strive to minimize the chance by adjusting our lifestyle and changing the environment, or strive for some kind of balance?

That is as much a philosophical question as it is biological, and one where the answer will vary by who is asked.

Personally, I will say this: If you're miserable while endeavouring to prevent cancer (or any other disease), that's putting the cart before the horse. The goal is, presumably after all, to live happily.