There's a "protector", but the protection isn't guaranteed to be 100% effective. That's an OK use of the language in this context and has many parallels in oth

There's a "protector", but the protection isn't guaranteed to be 100% effective. That's an OK use of the language in this context and has many parallels in other fields. E.g. using a condom as protection against pregnancy and disease. Many people have learned the hard way that it's not 100%.