Is Batman – The Dark knight jinxed?

Heath Ledger (Joker) – Dead
Morgan Freeman – involved in a car accident and hospitalised with broken bones
Christian Bale (Batman) – in the dock for assaulting his mother and sister

Jinxed or just plain co-incidence or am i reading a bit too much into it ? I had read something similar regarding a certain Superman movie starring Christopher Reeve.  Will dig for some info on that and post it if i can find any.