That is a very subjective description. One fatality per 100,000,000 miles actually seems pretty good, given how complex driving can be. And even then, that number includes the shitty drivers that account for most wrecks. The median driver is quite good, objectively.
I think it's also important to note that fatalities are not the only way to define dangerous. Plenty of accidents leave people disfigured, badly injured, permanently disabled, with lifelong chronic pain, and so on. While I'd certainly prefer any of that to dying, I'd rather have neither if I could choose.
Relative to trains & buses (airplanes is a separate niche entirely), cars are a lot more useful too. That is inextricably tied to why they are more dangerous.
That is a very subjective description. One fatality per 100,000,000 miles actually seems pretty good, given how complex driving can be. And even then, that number includes the shitty drivers that account for most wrecks. The median driver is quite good, objectively.