What do you expect a writer to be? ABY is an artist not a politician. That the AJC wanted to hear him and then didn't like his speech is their problem. His is whether he'll continue to get speaking engagements in the USA. His apology - for the perceived rudeness, not for what he said, which, after all, is his opinion - should be considered sufficient. Only persuasive arguments can, or at any rate should, change his opinion and obviously the ones here haven't.
4.2-scale earthquake felt in Dead Sea, Jerusalem area (Haaretz)
from the article: A.B. Yehoshua sends 'deepest apologies' for AJC remarks