In the 1997 book Open Secrets by Israel Shahak (Chapter 11) he describes a wave of hate mail he received after he spoke at a meeting in the Netherlands in 1974. An individual criticized him in an article which was followed by a wave of hate mail.
After [his] attack on me I received 1081 hate letters within two months. ... Only 36 were in Hebrew and 3 in French: the remaining 1042 were in English. Almost all of their senders provided their US addresses and identified themselves as Jews. They showed a complete ignorance of the matters at issue, confining themselves to calling me an enemy of Israel or of the Jews, or a 'self-hating Jew'. All of them wrote, however, that they 'were reliably informed' that I was a Holocaust survivor and hence my 'treason' was particularly heinous. Some deplored that I had not been exterminated while others expressed a rather curious view that had I been exterminated, 'a better' or 'more loyal' Jew could have been saved instead of me.Israel Shahak was a Holocaust survivor. One shudders to imagine the horrors he witnessed.
To use one's survival of the Holocaust against a Holocaust survivor is not good. We need to a debate to the issue at hand and not indulge in ad hominem attacks. Particularly ad hominem attacks like that.