This belongs in another thread really, but replying to this now as I missed it when you posted.
You are wrong, because it isn't just about how it effects people's votes, but it is inherently destabilising to the Labour Party because Corbyn and his supporters were railroaded based on the idea that any criticism of Israel is anti-semitic. Israel conducting ethnic cleansing against Gaza - which they are, it seems almost certain they will annex North Gaza having already violently driven a million people from their homes - will be seem as vindicating Corbyn in speaking up for Palestine, and potentially reignite Labour's civil war. The resignations of councillors is likely only the beginning of it.
Horror in Gaza Since our email was sent out this morning, Keir Starmer has written to all Labour…
labourlist.org
I know in my local area, popular North of Tyne mayor Jamie Driscoll was denied standing for re-election due to extremely tenuous accusations of anti-semitism - basically he shared a stage with Ken Loach and talked about movies instead of berating him for "anti-semitism" because he refused to disown all Labour members expelled from the Party based on anti-semitism. So opponents of Starmer were expelled for anti-semitism on spurious grounds for supporting Palestine. Ken Loach said it was a politically motivated purge so therefore he is anti-semitic and was expelled. Jamie Driscoll talked to Ken Loach about movies instead of berating him for being anti-semitic so therefore he is himself anti-semitic and was denied running for re-election despite local popularity and success.
Driscoll will be standing as an independent and taking most of the local Labour Party campaigners with him. This gives more energy to his campaign. And this is just one local area, I believe there are similar fissures and tensions in local Labour Parties around the country and this moves these tensions significantly closer to boiling point. As discussed on the Keir Starmer thread, there is also an attempt to unseat Starmer with an independent continuity Corbyn candidate in a constituency which is 30% Muslim and also with a high student population. I'm sure there are other manifestations of this tension around the country.
I will copy this post to the Starmer thread so you can reply there without derailing this one.