the docs[0] are clear:

> be careful: if you try to access an index which isn’t in the Vec, your software will panic!

> Use get() and get_mut() if you want to check whether the index is in the Vec.

In my experience, most people are using get() if the source of the index is untrusted

[0]: https://doc.rust-lang.org/std/vec/struct.Vec.html#indexing