A lot of this arguement goes to the acceptance or not of the IHRA definistions of anti semitism.
And whether the campaign to make this the official guide was to stop criticism of Israel and Zionsim.
What is so strange in picking up people in this country who say you shouldn't use the word Nazi in relation to Israel is that papers in Israel regularly use this eg www.haaretz.com/opinion/.premium-the-contract-on-corbyn-1.8192769/.premium-the-contract-on-corbyn-1.8192769
Unfortunately this is never a straight foward discussion which we should be able to have, not helped that the media loved whipping up the level of feeling because it was a way to attack Corbyn. Please note I am not a Corbyn supporter but when the British media only every reports one side of an arguement common sense makes you think, what's going on here?
Added to which some of the people who were involved in originally drafting it have also said it is being misused by conflating anti semitism with anti Zionism.
And why are so many people in the UK invested in the issue.
Because the British were the colonialists who gave away land that wasn't theirs to give away at the expense of the existing inhabitants, ie the Palestinians.
The long history of european antisemitism that allowed the Holocaust was never dealt with. Rather the europeans thought lets export our problem and let another group of people who weren't part of it, pay the price.
The era when the British (along with the French) carved up the Middle East is the root cause of many of the tensions there. We were arrogant enough to think we could create false nations eg Saudi Arabia to have client states in the region. But equally think who cares about the Kurds lets just draw a line/s through their region and parcel them out to other groups to rule over.
There are nearly 5 million Palestinian refugees who dont have any rights to their home land whilst Europeans and Americans with a homeland are allowed to move and take up residence in the area.
Whatever Europeans owe Jewish people for the horrors of the Nazi regime, it is not clear that by making another group of people pay the price has resolved anything.
The British Empire is constantly being called into account by countries colonised by us. Some people think we should take responsibility for the division and unfairness we created.