i need ideas on why tape recording someone without their knowledge is wrong and immoral.

Question

i already have right to privacy (the fourth amendment)

Answer 1

Yes, you have the right to privacy. In the expectation of privacy, when you speak so another party, you have a right to expect that the conservation is private. Recording it without your knowledge violates that expectation.

Answer 2

because the person you record could be hiding from some one in the witness protection plan and they could be found.
thats just the first idea that came to mind.