One of the ways Android protects application users from unwanted activities is by requiring every app to declare a set of permissions and allowing users to view those permissions during the installation phase. Don't like what an app can do? Just don't install it.
However, this all or nothing approach doesn't allow you to selectively turn off specific permissions, so if you don't like that an application accesses your phone state, you can't just disable that and still have the app installed. This forces you to either potentially compromise your privacy or miss out on what could be a great piece of software.