The massacre of Father Gapon’s followers…Bloody Sunday"? and Rasputin were the cause of the revolution. He should have had Rasputin and a couple of generals shot.
He certainly didn’t do anything about them. There were particularly bad ones in present day Ukraine where my ancestors lived right smack in the middle of NII’s reign. Many of the perpetrators were the Czar’s secret police who were not prosecuted.
I think the primary cause of the revolution was World War I. It put a huge strain on a weak system. And it shook the military’s loyalty which was what had saved the regime in past uprisings.