> They are not afforded Constitutional protection.
That isn't the case. Courts may, for instance, decide that a trade secret law that punishes leakers who were party to a contract or who obtained information through illegal means (such as via trespass) can be punished, but that such a law can't punish third parties who broke no law nor violated a contractual agreement in obtaining the secrets (such as is the case when they are mailed to you without solicitation).
All of the examples you cited (trade secrets, hate speech, and libelous/slanderous speech) have numerous caveats (trade secrets are limited by to what degree they have become public, hate speech is only exempted narrowly through title VII ( http://www.aclu.org/studentsrights/expression/12808pub199412... ), truth is an absolute defense against libel (that is in no way a tautology; it isn't an absolute defense in say, England)) that have been settled upon over time via drumroll answers to constitutional questions rendered by courts.
That isn't the case. Courts may, for instance, decide that a trade secret law that punishes leakers who were party to a contract or who obtained information through illegal means (such as via trespass) can be punished, but that such a law can't punish third parties who broke no law nor violated a contractual agreement in obtaining the secrets (such as is the case when they are mailed to you without solicitation).
All of the examples you cited (trade secrets, hate speech, and libelous/slanderous speech) have numerous caveats (trade secrets are limited by to what degree they have become public, hate speech is only exempted narrowly through title VII ( http://www.aclu.org/studentsrights/expression/12808pub199412... ), truth is an absolute defense against libel (that is in no way a tautology; it isn't an absolute defense in say, England)) that have been settled upon over time via drumroll answers to constitutional questions rendered by courts.