I know, I posed the same question to Mastaan Khan, when he talked of blood money. I know it sounds like a shitty thing, to accept money for the murder of your brother or son etc but it IS Islamic law. And there is a very good reason behind it, I discussed it in my other post.
Yes, I would be very angry and I would want nothing more but to pursue charges against the killer. But that's because with Allah's graces I come from a family of little amount of means. And I take, many of here have good financial backgrounds. Sure, money isn't everything, but it is many things. So we wont understand the pains of living in poverty. The pains of watching your kids grow without any bright future.
That's why there is the law of Diyat. A family which looses a member and that too one who is the sole provider. What would that family get if the killer gets hanged?? Once again, this thinking will only hit you when you're thinking in calm and cool manner.
Right now emotions are running high among Pakistani people, just as when the murder took place and the families in their anger said they would pursue charges over anything. Two months past and they thought of their future and back tracked. A week from now, same people who are hanging their heads in shame will have calmed down and will think rationally and know what families did was justified from their POV and Islamic.