Yes, you can also write safe code in an unsafe language, but until you are literally willing to code review every program anyone writes in your unsafe language of choice, there is value in having safe languages where we don't have to rely on your throughput and accuracy.

There is a real difference between a safe language, and a safe subset of an unsafe language that gets verified by some guy (no disrespect). The former is (everything else being equal) just way better for everyone involved, especially for the guy.