You're the one who said that no one would know if they'd kill to keep a loved one alive until they were in that situation.
I call bullshit.
Let me know when you're put in that situation.
I'm the widow of someone who died while on a transplant list.
Never would it have occured to me that it would be justifiable to kill someone else to get him a new kidney.
That is immoral.
So, yeah, bullshit on your argument.