There has to be unsafe code for that to happen though, if you consume a crate which doesn't touch unsafe at all then it's only going to happen if you write the

There has to be unsafe code for that to happen though, if you consume a crate which doesn't touch unsafe at all then it's only going to happen if you write the sloppy unsafe code which makes assumptions that don't actually hold. If you blindly pass indices from code you didn't write and haven't audited into Slice::get_unchecked() then that's on you, if you're not willing to do your due diligence then stick to the bounds checked version. That's what it's there for.