goldvelvet, I really don't think anti-Semitism at the time of the Nazis can be described as the feelings of 'a few at a moment of time in history'. For one thing, if it was only a few people who felt that way then it would never have been allowed to happen. But also, anti-Semitism has been widespread across Europe since the Middle Ages, possibly earlier - if anything, the present day is the 'moment of time in history' where these feelings have diminished, rather than the other way around. It wasn't confined to the Nazis and their allies, either - in Britain we had plenty of fascists of our own.
I know quite well a family (in this country) where all the members of three generations on one side have committed or attempted suicide because of the effects of the Holocaust. Only the eldest was himself in a concentration camp, but the psychological effect of seeing what that level of evil had done to their close family led his children to take their own lives, an effect that was likewise passed down to his grandson, who is only in his twenties now. You can't dismiss the Holocaust as something that happened 'in history' because for many Jews it is still a very real event that continues to affect their lives today. 70 years is just not enough time for an ethnic group to say 'Well historically a group of people tried to exterminate us from every country on the planet and succeeded in murdering over a third of us globally in brutal and degrading ways, including forced medical experiments, while causing untold psychological damage to countless more, and for the majority of our oppression the rest of the world just looked on. But people's attitudes have changed now, so we'll be fine'. You can't possibly compare that to the threat of invasion of the UK by the Germans. To a hypothetical situation where they invaded, rounded up most of our population then tortured and murdered one in three of us just for being British, not to mention invaded other countries in order to wipe out British expats there, maybe - but I think it's a reasonable assumption to make that we'd still be 'shifty and paranoid' around them if that was the case!
I'm not trying to excuse the current actions of the Israelis, just saying it's not at all unreasonable for Jews globally to still fear persecution. If the equivalent happened to the Palestinians you wouldn't expect them to be over it in three generations - in fact I imagine it would be difficult now for many of them to completely trust the Israelis within that timeframe, even if the bombing campaign stopped immediately, pre-1967 borders were re-established tomorrow and all refugees were allowed right of return. And looking at this purely numerically, the number of deaths in Gaza alone would have to be greater than 600,000 to be comparable in scale to the Holocaust. Try coming back from that in less than 70 years.