Mr. Dershowitz critiziced your decision to open your doors to anyone criticial of Israel. Thus "proving" how open-minded you are. Simultaneously you will not allow the "right" to try to prove their view. Thus it is incorrect to counter Mr. Dershowitz's claim by defending your political point of view. (This is not the point here.) To be sincere you ought to state that you made up your mind about where Israel should be heading and hence will not let others try to prove their point of view... Just say that you will only let certain views to be discussed via your platform. Make this transparent. Thus everybody will know what to expect.
North Korea insists it 'regrets,' not apologizes, over mine blast that killed 2 South soldiers (AP)
from the article: J Street's challenge to the U.S.-Jewish right: Focus on peace