In short, I don't really care about the families of the law breakers.
I'll bet that if they were aware that their relatives were committing robbery, they would not have reported them to the police, making them accessories to the crime. So the message here is, if you feel that a family member is committing criminal offences, report them to the authorities yourself, and perhaps save their lives, if you don't and they are killed whilst committing an offence you have no one to blame but yourself.
In this case the burglars knew the possible consequences of their actions and knew that it was sanctioned by law, if they didn't, ignorance of the law is no excuse..
I agree that, those who wish to prey on society must take the risk of becoming a victim of that society. I think that Texas has got it right in this respect and wish it was the case in Australia.