Avira
“Ubiq, there are many answers as to why it’s not mentioned in the rif, rosh and rambam’s yad. One of them, which my rebbe rav belsky said, is that they aren’t dinim, but they are realities that chazal warn us about. If we do X, we will he hunted, like the gemara says, as animals in the field. Slaughtered. And that’s precisely what happened.”
sure there are reasons for anything you want to be true. Though these reasons, like the one your Rebbe Z”L gave tend to be weak. you say thye “aren’t dinim” there goes the entire argument. So Its just a bad idea, not assur.
and the bad idea is further weekned when you consider that its not like there want Jew hunting going on in Europe pre State.
Again I’m not trying to convince you of anything. Though Hopefully you can see that these arguments tend to be a bit forced and built on preconceived notions. You arguments n this thread are PERFECT examples