E-mail is not private, in effect. But passing a law allowing it to accessed and read would allow it to be used as evidence against you.
For example, hypothetically, you receive investment advice spam through e-mail as part of a personal effort to learn more about economics. Intruder, looking for a case and maybe some extra revenues/debt, reads it and assumes that you have extra money to invest, even though you’re poor and haven’t hidden any income from anyone. Heh...there you are. Trouble.
Imagine uses of exaggerations and false assumptions from such information used against you in the current, hysterical political atmosphere. As for snail mail, I saw a case where police illegally received and opened letters from a postal employee during the ‘70s with no punishment for doing so.
We’re morally bankrupt as a nation. We’ve become un-American in regards to what our country once was. Look closely at the demographics of politicians and other leaders of the past for a clue.