Thats the point.
You cannot assert your rust program cannot crash.
Even if your code is perfect, there may be bugs in either the std library or some dependency you use that does crash.
Im not saying everyone uses unsafe code (or should) in their own code. Far from it.
Im saying that every rust program invokes unsafe code at some point.
So this myth of the 'pure rust' that is 'completely safe' is just that. A myth.
I dont understand why this is difficult idea for people to accept. Just use the good bits of rust. rust doesnt need to be 100% safe; its not, and thats completely ok.