Dr. Aaron E. Carroll writes in The New York Times:

Too many view protective measures as all or nothing: Either we do everything, or we might as well do none. That’s wrong. Instead, we need to see that all our behavior adds up.

Each decision we make to reduce risk helps.

When we’re doing activities that increase our risk of head injury, we wear a helmet.

We don’t take our seatbelts off when driving fast because “oh well, what’s the point”.