a reason why lily didn't have to die..........

[hickengruendler]

No: HPFGUIDX 82349

 
I really think that some users take Voldemort's words that Lily 
didn't have to die a bit to literally. He said something like "Step 
aside, silly girl", because Harry was his main target. My guess is, 
that he would have killed Lily anyway. Why should we believe anything 
he says? There was no need to kill her, if he really didn't want to. 
He could have stunned her and his way to Harry would have been free.

Hickengruendler