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To respond your points: 1) The National Council of Young Israel is I believe the parent body so to speak of that speaks for Young Israel type Jews - Which is what I meant by calling it ""branch of Judaism"". I am not aware of them being an advocacy group. Perhaps you can source your statement for that. Your personal feelings on their opinions and what you imagine them advocating obviously does not count here. What matters is that they are a notable organization by WP standards (while your neighborhood association probably is not), and therefore their opinion is notable on Wikipedia too. This is in addition to the fact that they've been cited by a noteworthy newspaper, The Jewish Press. 
2) You haven't stated why their opinion is not relevant to Goldstone himself. While there has been much criticism of the Goldstone report which has been covered in that article, this criticism is specifically about giving an award to Goldstone himself and rightly relevant to an article about him and the awards he's received. 
3)The point is that there should be balance in the article with a NPOV. I don't see why the criticism should be incorporated into the rest of the article and not in it's own section, specially if there is a section dedicated to his praise.   "