Unlike Yosef HaTzaddik who said “Ani Yosef, haOd Avi Chai?”, I am not Joseph nor any other poster by any other name.
JayMatt:
I’m not sure what proofs you refer to, but I do think the kitrug was irrelevant to the post. I didn’t mean to say these situations (pesel Micha, seudas Achashveirosh, et al.) are off-limits to discussion when on topic, but I don’t see the point of arbitrarily bringing in “halalu … vaHalalu”.
Regarding Oy laRasha, are you saying that it only applies to Jews and not at all if non-Jews are involved? Why?
As for a source, I mentioned earlier that Oy laRasha is mentioned in parshas Korach. Rashi in the beginning of the parsha quotes it from the Midrash Tanchuma.
Health posted about “Kivan sheNitan rishus…” If you look at the Lekach Tov, by “Pen Tisafu bichal chatosam” in Korach 16:26, he says explicitly that even those who did not sin had to separate themselves because “Kivan shenitan rishus…”
Besides for this, however, if you look at the Midrash HaGadol later on, under “Hibadlu mitoch haEida haZos”, you’ll find something that might be relevant here: he writes that had not Moshe davened for them, they, too, would have been swallowed up like Korach because they listened to Korach’s blasphemy and did not protest. So there is what to be said for protesting, though contemporary gedolim have anyways ruled like this, in certain cases, as mentioned.