Yes/No... like if someone goes and writes "Kill the Fags"(sorry but getting point across) then yes. But if someone hold up a sign saying Homosexuals will go to Hell for their sin. No because that is their right.
Writing that is a crime because it is obviously an incitement to commit a crime, the later is not an incitement and is just an opinion, obviously protected under the First.
To all those who are using the example of killing a man you caught sleeping with your wife:
Depending upon the circumstances, a good lawyer could probably get you manslaughter on grounds of diminished responsibility (or whatever the US equivalent is), especially if you actually caught them at it, as given the circumstances, its reasonable that you'd be rather irate and therefore not fully responsible for your actions.