Your example doesn't make sense. Keep in mind that an out of bounds array access can cause a lot of problems; in the best case, it would cause a segfault, and i

Your example doesn't make sense. Keep in mind that an out of bounds array access can cause a lot of problems; in the best case, it would cause a segfault, and in the worst it would allow for code injection. So there isn't really a case where accessing an array out of bounds makes sense. That's where the idea of "expected vs unexpected errors" comes from. Another way to think about it is that some errors can be handled and some can't. For example, most of the time you can't "fix" a segfault, so it makes sense for that to just crash the program.