LV, Harry, DD and the Power behind the door

[amanitamuscaria1]

No: HPFGUIDX 110323

Hi - I've had a brief look through all the posts since the Edinburgh 
addition of knowledge, but noone seems to have brought these threads 
together. Apologies in advance if I've missed it.
LV never has loved anyone. He has gone through multiple 
transformations to become what he is, and is looking for immortality. 
DD didn't try to kill LV in the MM. Harry has large quantities of the 
power behind the locked door, power of which LV has none.
The power seems to be love, or something similar. What if some of the 
transfigurations LV went through caused him to give up his heart? So 
he now has no way of loving anyone. The possession of Harry by LV 
causes Harry to think of joining Sirius, driving LV out - love, the 
emotion he can't experience. As for DD not killing LV, I waver 
between several theories. One, he can't be completely killed, because 
he has no heart; two, killing him would make him into a ghost or 
worse, a poltergeist like Peeves - yikes!; three, LV and Harry are 
linked, so someone else killing LV would cause Harry harm, allowing 
LV to possess Harry totally. I'm rather inclining to a combination of 
theories one and three.
Cheers. AmanitaMuscaria