If some one created a time machine then some one else stole it and used it to travel back in time before it was made and stop/erase its maker before he made it then it would not have been created in the first place and the whole situation would not have taken place and the person would be stuck in a time loop in which he can't get out of because he does not know he is in one. If this was true then everyone would be caught in this loop and no one would continue their lives at all or would he be the only one along with the time machine creator.