Why Explicit Implementation of a Interface can not be public?

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The reason for an explicit interface implementation is to avoid name collisions with the end result being that the object must be explicitly cast to that interface before calling those methods.

You can think of these methods not as being public on the class, but being tied directly to the interface. There is no reason to specify public/private/protected since it will always be public as interfaces cannot have non-public members.

(Microsoft has an overview on explicit interface implementation)

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