Justice League: The Flashpoint Paradox

Never been a huge fan of the Flash, but after watching the new TV show I have become a semi fan. I loved the story, but the main plot has me puzzled. So Flash goes back in time to stop Zoom from killing his mom which causes a paradox. Yet the paradox is really why Zoom killed her in the first place, because he is from the future and if she did not die there would be no Flash or else she lived and there was a Flash and Zoom wanted to kill her to hurt Flash. Either way there would have been a Flash, so him saving her should not have mattered. Either way it is entertaining which is all I ask for from a comic book. It is worth a watch from any DC fan