ubiq: Those comments were to APY (whose comments I quoted before making the comments you’re quoting), not you.
iac: You do not know that they “were both well versed in these areas”. In the pre-internet era it was not common knowledge among the general population even in the countries that celebrate this, and even by gentiles – let alone Jews, what the origins of Halloween was. And Halloween wasn’t hardly known altogether in the European shtetl as it is mostly celebrated in English-speaking countries. You think the rabbonim are all bukis in all the Christian and secular holidays, including their origins?