I would usually agree with this kind of normalization, but in this case I actually think it would actually obfuscate the picture. Safer roads are a good thing, but if traffic deaths are reduced because more people bike or take the train, that's still a win. Roads and cars are inherently dangerous, and that danger needs to be minimized using multiple strategies. We need to focus on holistic changes that consider people's behaviour and their interactions with the built environment.
When people feel they absolutely need to drive, that's a failure of infrastructure.
"Look! New white shoes!"