I agree that the law doesnt prevent people from doing things, and technology is important to prevent "snooping." However, under a Supreme Court case in 1963, Katz v. United States, the court held that you only have an expection of privacy in some activity if you both objectively think it private, and society recognizes this expectation as reasonable. Thus, the law has a role in determining what expecations of privacy are reasonable. Before Congress amended Title III to cover cell and cordless phones, the courts ruled that people could not possibly think that such calls were private, and therefore, it was free reign for cops, or anyone else to listen in and do anything they want with the calls. After the statute was passed, while it is still techically possible to intercept, we have firmly established a privacy right. This is, IMHO, an important statement about personal liberty.

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