If they can turn back time...
If wizards have the time turner and they can turn back time why dont they just go back in time, before voldemorts rein and kill him... then they would not have all of the suffering of the families who had lost loved ones to him or his followers. and Harry Potter would just be some normal kid, instead of being orphaned and having to live with the dursleys...
why dont they just go back in time and use the turner???!???