Dr. Christopher Duntsch was either a serial killer, sociopath or dangerously incompetent. Or all three. From the moment showrunner Patrick Macmanus began writing “Dr. Death,” the Peacock miniseries premiering Thursday — based on a Wondery true crime podcast on the spine surgeon’s downfall — he knew one thing: It’s impossible to know why Duntsch destroyed so many lives. “It would be easy to toss a black hat on the guy and call it a day because it would make us feel better to be able to just say he was a psychopath,” Macmanus told the Daily News. “But the truth of the character is he was more co...