It goes a little bit beyond religious fanatics when it is written into the laws of the country. Also I don't know her personally... she may have wanted this to happen to bring attention to it, she may have thought her father would never go that far. Not enough information in the story to know for sure.
There is no law saying that a woman should be killed for marrying for love. There is a
tradition that is both cultural and religious that says that a woman who marries outside of her family's wishes may be killed.
The law, which you seem so eager to point out, is that victim's family may forgive a murderer, and the murderer may be allowed to go free. That's how 'honor killings' are so-called legal; they designate certain people to kill the victim, then the family forgives them, so the killer is freed.
In this particular article, Farzana Iqbal, the victim, was waiting to appear in court to explain that her new husband did not kidnap her, as alleged by her family. While she was waiting outside the courthouse, her family attacked her and killed her. Her father admitted to participating in his own daughter's murder.
You are attempting to excuse this murder with shaming the victim, and attempting to place the blame squarely on her.
