answer:Two answers. One is technical and the other is philosophical. The technical answer is that they mounted those application a write-protected partition and you, as a non-superuser, lack the permission/authority to delete these. Only a jailbroken (in Unix terms, a superuser) phone has that ability. The philosophical answer, of course, is that Apple thinks people are stupid and doesn’t trust them to control their own equipment. So they control everything and lock down the phone. That is why I bought my Android. I have control. Not the late Steve Jobs.