Let's divide the expression of certain opinions into four categories.
- Correct. This is speech one outright agrees with -- you think is correct on the merits.
- Legitimate. This is speech you do not agree with, but you concede is within the bounds of legitimate argument. "Reasonable minds can differ" and all that.
- Permitted. This is speech which you neither think is correct or legitimate, but which you agree one has the formal legal right to say.
- Impermissible. This is speech you think should be legally prohibited.