Can you elaborate on what exactly do you mean by " software should be expected to provide some basic level of protection." ?

In some sense security is binary - if your software happens to have even a single mistake that results in RCE or authentication failure, then it's totally exploitable and does not provide any level of protection whatsoever. And as experience shows, we seem unable to write any software without such mistakes, even if we try really, really hard by skilled people with security in mind, as far as I recall every popular piece of software that needed to be secure has had vulnerabilities.