Apologising - or, worse, being forced to apologise - for something that doesn't need apologising for shows lack of courage. The pro-Israel lobbyists and the Board Of Deputies will soon cotton on to you for doing that, and will strike when the time is right, just before the next election, for example. Don't think that this "Labour antisemitism" stuff is going away any time soon. It's far too useful a weapon for keeping Labour out of power for that.