Prolly cuz everyone on Earth got tired of their BS…like when they had to flee the US to Mexico. Hell, even one of Abe Lincolns campaign posters promised to eliminate the “twin relics of Barbarism” - slavery and polygamy.
I think Christmas has become the poster child for this unending cycle of “event seasons” that is pushed by retailers. New Year’s celebrations and sales give way to Presidents Day sales and Valentine’s (if you really love her you’ll spend $10K on a real blood diamond) then it’s Easter (gotta buy cute new clothes for the kids to celebrate the rising of the Christian lich god) then Mother’s Day, Memorial Day, Pride Month, Fourth of July, Back to School, Labor Day, Halloween, say hi and bye to Thanksgiving bc Christmas ads featuring white people buying ridiculous shit for their spouses take precedence.