[ceejayoz]

Libel law disagrees with the Constitution by a literal reading. So does banning human sacrifice in religious services. We still treat them as legitimate.

[kolanos]

Libel is a civil matter. The government can't charge you with libel.

[ceejayoz]

The government provides a judge and courtroom, decides the result, and enforces the judgement.

If you prefer a criminal matter, swap it out for fraud.