MDD:
1: Yes. (Even though it wasn’t a proof, it was a quote). Just like I would quote Shakespeare.
2: I never claimed the list was exhaustive. However, I’m talking about Chazal’s list.
3: Somewhat correct. There are Mitzvos Sichlios that everyone should be keeping, and Chukim that those who have not been taught would not know, or refuse to keep. I refuse to blame someone who went through the Holocaust, or got Meanesed in the Mikva, or who was degraded by his Rabbaim for not keeping the non Mitzvos sichlios of Yiddishkeit, even out of spite.
That all being said, I’m not discussing what should be done Halachicly. Ask your LOR for that. I’m (and I thought Joe as well originally) am discussing what the Ribbono Shel Olam will do. For that I refuse to judge.
Reb Doniel: I wouldn’t disagree with most of what you said (her children are Jewish, though, and she does have Dinnei Niddah, can’t use them where Amirah L’Akum is muttar, etc.). That is not to say that the Ribbono Shel Olam will punish them for their actions. He may, and He may not. That is for Him to know.