Well, the thing is that the "anxiety" isn't something that would make a person being against Genociding others as it's all about self-protection and it might even make genocidal violence more likely: it's far easier to spread the Fear that "they are against us" and convince people about how "we have to get them before they get us" in a climate of high anxiety (which seems to be something policians of all colors have for decades continuously cultivated in Israel and even amongst the Jewish Communities abroad), which makes extreme mass violence against the "others" deemed "the enemy" under the cover of "self-defence" be more likely rather than less likely.

The thing that would make being against Genocide more likely is Empathy with the hurt of the victims, and not all of those who went through the trauma of the Holocaust will have come out of it with that (for example, trauma also can create Sociopaths, the very opposite of people with high empathy with the suffering of others), plus empathy is a lot harder to transmit to both friends and descendants than anxiety, plus one of the things Racism does is close down empathy towards specific "others" based on their ethnicity (hence the relentless "they are " prejudiced messaging against Palestinians and Arabs in Israel, as well as the "human animals" and "vermin" dehumnization of Palestinians, all of which is obvious propaganda to breed Racism).

Mind you, plenty of Holocaust Survivors do have that Empathy and even fight to stop the violence (and even get called anti-semites for it, as the Press did to a Jewish Holocaust Survivor in the UK some years ago because in a Conference For Palestine he compared some of the actions of the government of Israel to those of the Nazis), and I suspect that due to that experience they're a lot more likely than the average person to be deeply against such extreme violence as a Genocide, it's just that I don't think they add up to enough people compared to the population of Israel as a whole, the transmission of the kind of emotional relation to others that makes one be against it down the generations and laterally to people like friends is nowhere as strong as the transmission of the fear and anxiety which can be easilly weaponized to make the violence more likely and what politicians in Israel have from the very start been doing is cultivating the transmission of anxiety and fear, not of empathy.

IN SUMMARY: Holocaust Survivors in Israel were always a small minority and their experience has been very purposefully weaponized by local politicians to spread amongst the majority the irrational fear and anxiety that make Israelis more likely to commit extreme violence against others whilst genuinelly believing it to be "self-defense", whilst the positive things like "empathy with the pain of victims" had their transmission suppressed or at the very least only spread naturally (and against relentless society-wide Racist messaging meant to reduce empathy) at a rate which is much slower than the rate of spread of fear and anxiety, hence the impact of the existence and presence of Holocaust Survivors on Israeli society probably made this Genocide more likely, not less likely (and I suspect it's the very opposite of what most Holocaust Survivors would've wanted).

PS: Judging by things like Holocaust Survivors who too openly and strongly critize the actions of the government of Israel being called anti-semites, it seems logical to think that the Israeli politicians activelly try to suppress the transmission of empathy, making it even slower than the natural rate of transmission would be.