There's no way to make yourself safe from car crashes unless you confine yourself to your house. Even if you never drive, you are exposed to vehicular death simply as a pedestrian. There's no way to avoid it without becoming a hermit.

Meanwhile, it's pretty much trivial to make yourself safe from terrorism, if you wanted to. Avoid airplanes, avoid skyscrapers, avoid major cities. Done. Tens, perhaps hundreds, of millions of Americans already happily live this way, although most of them don't do it specifically to avoid terrorism.