Killing James, gracing Lily?

[chrusotoxos]

No: HPFGUIDX 151770

Why Lily had to survive?

Hi! Just read a JKR interview 
(here: http://www.mugglenet.com/jkrinterview.shtml)
and am wondering if she gave something new away...but if this topic
has already been discussed, please let me know.

It seems to me that we learn more about the Avada Kedavra curse;
listing our informations:

1) it kills instantly, without marks

2) nothing changes if you die to protect someone

3) if, however, you are given a choice and sacrifice your life for
someone, your wish is granted

Point 2) was murky to me till this morning: I always wondered why
nobody before Lily Potter had died to protect family or friends. But
now we know this secret, unknown to LV himself (anyone has read The
Neverending Story out there?). Now we know (or did we know it before?
is this old news??) that LV wanted to kill James and Harry, but not Lily. 

Is (wad) DD aware of this? He always said his mother death protected
him, but never said why or how. IMO, he didn't know.

But the important question is, why James and Harry? Why not Lily?
LV doesn't love anyone, so we must know where his interests lay. So
ok, he fears the child of the prophecy. And James may well be
considered a blood traitor. But Lily is a Muggleborn...why did he need
her alive?

Sorry for the rambling, I'm trying to find a rational explantion and
can't. Hope you do.