even if the time turner went back that far, they would create a paradox. by killing voldemort, there would be no need for their future selfs to go back in time to kill voldemort and so they wouldnt and so he would be alive and so they would kill him (past) ect. its a paradox. When hermione and harry used the time turner to save buchbeak and rescue sirrius, their past selfs believed buckbeak was beheaded, so that they believed they had to save him inorder to save sirrius, and so they could
*PotterHEAD
*PotterHEAD