What's ridiculous is placing all these holidays on the same footing as Christmas.
Even if I were African, with fully pagan African culture (which the American Blacks buying Kwanzaa stamps are NOT), I don't think Kwanzaa would have the same place in my life that Christmas has to a Christian.
Is the festival of lights, Hanukkah, even that big a deal to Jєωs, as Christmas is to Christians?
And Diwali for the Hindus. Are they all really comparable? Something tells me they scraped the bottom of the barrel of these other faiths, so they aren't left out during Christmastime -- to be ecuмenical. But if I were them, I'd feel a bit patronized and even silly.
Imagine putting some great holiday of another religion on the same footing as, say, St. Felix of Valois on Nov. 20th. With all due respect to St. Felix, I'd feel kind of silly placing a holiday that's really not that important in my religion, on the same footing as a holiday of eminent importance in another religion. Even if I believed that other religion to be in error. I'd still feel funny buying stamps for some obscure saint, because that's the closest saint to the Birthday of Mohammad or something.
Just being objective here.