For many years, I was addicted to reading astrology columns. As the early day comes into being, the first thing that I used to do on the web was opening astrology sites. Many astrologers are very negative and give depressing predictions. I have spoilt many of living days by imbibing their thoughts. Now I have stopped reading astrology.
As an Idiom, astrology murderer means a negative, depressing astrology prediction.
Example: The world is burgeoning with quacks, who are unaccountable to their professions and engaging in the schadenfreude of being astrology murderers.