The Company says it wants to promote employee well-being.
The Company is all behind Ethnic-of-the-Month Month posters, and off-hours volunteering, and after-work community building, and family support, and all that good stuff. You notice that aside from the posters, all that other stuff doesn't cost The Company two red cents.
When the US Gummint declares a federal holiday, and all the schools and businesses are closed, and our families have the day off, we can use up a vacation day if we want to be with everyone else. After all, if we all had a day off, it might affect shareholder value or something.