I am chewing over what you said. Don't necessarily agree yet but chewing on it.
I will comment on this now though.2) How do you think your Jewish neighbors would respond to you not thinking they're chosen or that they're not protected by God? Coming from a Jew, too often I've heard this argument in the middle of hate speech.
I am not sure but I think most of them would not care at all but avoid the conversation. Most of them have no desire to speak of anything spiritual. Out of about seven families there is part of one that actually practices Judaism. The closest one is big in the Taoist stuff. Super liberal most of them. Good chance most of them would have been stoned to death years ago if we were living in OT times.... but I digress.
First I never said that any of this blessing and cursing stuff had any relationship to if they were/are chosen for a specific purpose. If you see it intimately connected I can understand but I think the chosen aspect can stand alone without your interpretation of the verse in question. As for the protection part I am a bit in the dark for what context you have here. Can't really comment.
With that said I am not quite sure what argument you mean. If the Jews can be chosen and protected without a need for reciprocal blessing and cursing I don't see what you are saying. That and I can testify to you I don't hate anybody. Take that for what it is worth.