This could go on all day. The fact that anti semitism exists in society is undeniable, surely? As MN users are a representation of the rest of society, there will be users who hold anti Semitic views. I don't think these are always blatant or overt, but they definitely exist.
I can only remember a few instances where posts/comments have been deleted when they have obviously been posted to stir up hatred (I remember one about Jewish bankers) but there are definitely occasions where people skirt under the radar so to speak, and reveal an anti-Jew sentiment (for want of a better expression), or yes, hide under anti-Israel sentiment. Agree these are not always obvious to non Jews, but I don't see how people can possibly deny the existence of anti semitism.
If you want an example of my last sentence "she was from Edgware which seemed to be a Bec stamping ground, there and Brent Cross shopping centre).Who said it? That's right, other Jewish girls" from the post after my earlier one, to me, contains a distinct sneery tone with its talk of stamping grounds and patronising rhetorical questions. There's no point in flagging it as an anti Semitic post in need of deletion, but to me personally, I find it mildly offensive. That's just one post amongst very many where no doubt people who aren't Jewish, or of Jewish heritage etc, would deny anti semitism, but it's there, and previous personal experience makes me pick up on it. It's not all police and guards at synagogues, it's things that are regarded as "minor" and dismissed or denied by others.
I think it's important that Jewish people are allowed to raise concerns without fearing they will be dismissed, and their experiences should be acknowledged, as it is part of the bigger picture.