I am pretty sure that you can avoid risks during driving but cannot avoid risks when flying commercially.
"Flying is safer than driving" claim probably comes from some metric that is relevant to insurance companies when calculating premiums but irrelevant to private travellers because they can choose not do drive drunk or take risks.
You can't make decisions for other drivers though. There is no FAA-like organization making sure all the other drivers on the road are as safe and responsible as the people operating your airliner.
The claim that "flying is safer than driving" is based on fatalities/mile traveled.
