Leibler makes his case very strongly. There is a very big difference between criticism of Israel as opposed to demonization and delegitimization of Israel. Those who actively seek to undermine the legitimacy of the State of Israel have crossed a red line as far as the mainstream Jewish community would be concerned. To expose such jews as being outside the mainstream is not Macarthyism - it is as Leibler says, "common sense". No-one is trying to silence them or restrict their freedom of expression, merely identify them and expose them for who they are. The attempt to stifle opposition to such demonizers of Israel by calling their critics such as Leibler, Macartyhites, is a calculated and cynical attempt to silence, bully and supress anyone who would dare speak up and expose them. Ironically, such intimidatory tactics are the only real instance of violation of freedom of expression here.
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from the article: Response / On 'exorcising' Israel bashers from the Jewish mainstream