The relevance is, those who observe the american “holiday” halloween are not observing the pagan holiday or its version borrowed by the rc church. they are using its name.
You could say the same about Christmas. Most treat it as a secular holiday, a day off to go shopping, get discounts and put out a cute Christmas tree and lovingly give family members presents. Do you give Christmas gifts? (You can always choose to call it a “Chanuka” present.) Despite the constitutional laws separating Church and State, even the United States recognizes Christmas as a secular legal holiday.
GAON: Again, the Roman Catholic Church has long ago Christianized All Hallows Day. It is no longer just pagan.