There are two issues. First the terrorist had a right to an expectation of privacy to areas we all expect privacy - our homes, our cars as we go about daily life, what we say in private conversations on our phones, for example. Once the gummit has a rational reason to believe we are committing crimes in our homes, cars or on phones, traditionally it can get a warrant to discover what we are up to. The terrorist gave up her right to privacy concerning phone calls back in Dec. So, this has absolutely no comparison to Snowden.
The second issue is Apple's right. Apple sells a product that has as one feature an ability to defeat the gummit's ability to see what's in it, that is who called and any data stored on it. The purchaser, the terrorist, no longer has any claim to privacy. Where does Apple derive any right to not allow the gummit access to that PARTICULAR phone? Seriously. I'm asking. Is it just that Apple thinks if it allows access then it's products will not be as appealing to purchasers?