If you want to read Dershowitz's excellent critique of the Goldstone Report, here is the link: http://www.alandershowitz.com/goldstone.pdf Once you've read the critique, you will understand why Dershowitz has used such strong language when describing Goldstone's role in the report. To #4: in SA freedom of speech is constitutionally g'teed. And based on the critique, I think Dershowitz's comments about Goldstone are fair and reasonable.
Zionist Union announces support for so-called anti-terrorism bill (Haaretz)
from the article: Dershowitz: Goldstone is a traitor to the Jewish people