To the Editor: Re “Is Anti-Zionism Antisemitism, by Definition?” (front page, Dec. 12): What is Zionism? To me, being a Zionist in 2023 means that I accept the right and the necessity of the survival of the Jewish people and the existence of a Jewish state that ensures their survival. Anything that undermines or threatens Israel’s survival also undermines or threatens the existence of the Jewish people and is, ipso facto, antisemitic. Philip B. Berger Toronto To the Editor: I am a Jew by culture and ancestry, albeit a secular one. I abhor contemporary violence by both Hamas and Israel....