My understanding is that the user who writes an unsafe block in a safe function is responsible for making sure that it doesn't do anything wrong to mess up the

My understanding is that the user who writes an unsafe block in a safe function is responsible for making sure that it doesn't do anything wrong to mess up the safety and that the function isn't lying about exposing a safe interface. I think at one point before rust 1.0 there was even a suggestion to rename it trustme. Of course users can easily mess up but the point is to minimize the use of unsafe so its easier to check and create interfaces that can be used safely