No right is unlimited, even if it's in the constitution.
For example, libel, slander, and harassment may all take the form of "speech" but are unquestionably firing offenses. Those are also criminal offenses because the balance of harms swings away from the person who's free speech rights might be violated, toward the person who's own rights are being violated due to the exercise of free speech itself.
As that old adage goes: My right to swing my fist ends where your nose begins.
For example, libel, slander, and harassment may all take the form of "speech" but are unquestionably firing offenses. Those are also criminal offenses because the balance of harms swings away from the person who's free speech rights might be violated, toward the person who's own rights are being violated due to the exercise of free speech itself.
As that old adage goes: My right to swing my fist ends where your nose begins.