It's just hard for me to imagine someone accidentally messing up nonnullness or aliasing, because it's really in-your-face that you need to be careful when cons

It's just hard for me to imagine someone accidentally messing up nonnullness or aliasing, because it's really in-your-face that you need to be careful when constructing a reference unsafely. There are even idiomatic methods like ptr::as_ref to avoid accidentally creating null references.