True, but unsafe let's you conjure up any lifetime you want, or any lifetime necessary to satisfy the lifetime requirements in safe code. If you generously sprinkle pointer dereferences in unsafe code, you effectively disable the protection provided by the borrow checker – including in safe code – until you've checked and verified the correctness of all unsafe blocks.

Yeah but if you have tried writing unsafe Rust, you notice that you are obligating yourself to write code that is much stricter than C.

E.g. in C you can write code and say "don't call it outside the situation that this function was written for" and then blame [0] future users of the API.

In Rust you need to actually make sure that your code works, i.e. your safe interface is not unsafe.

[0] The blame game is not a technical solution to a technical problem...

Borrow-checking the dereference of a stale pointer won't be worth much, though.