Well Esca, you make a number of decent points.

The thing is that a number of the things you mentioned are merely one story in a number of different ideas. Most of this is in your final "Friday the 13th" passage.

The 13th moon or Blue moon or Harvest moon wasn't the source of deception. And many factors of cultural tradition affect the number 13.

The Egyptians believed the 13th step in life is death (although they liked death)
The last supper had 13 members.
Plus many multiple other theories and ideas

Friday was disliked because the main power during the middle ages, the roman catholic church, disliked paganism. Friday was the best day of the week to pagans and inversely became the worse to Catholics. (Friday is Freya-day, or day of the norse goddess of love.) But even that has more explanations/ideas/theories.

The truth is people just dislike change. So clocks will stay the same and all that jazz. sorry.