And PHB1 may have been made with the idea that most pallys would be good or unaligned, but you can absolutely make an Evil Paladin of Asmodeus right out of the box. I don't see a good reason to take that away in Essentials, besides pandering to the older-editions crowd.
That's because there isn't one. Essentials is a blatant attempt to draw older players away from Pathfinder, and this is just one more element of that plan.