I don't think anyone is blaming them for their own murders. It's not like the R's asked someone to kill them. But something they were doing led to their murders so they actively participated in the events that led to their deaths. Even if the deaths were over child custody then the R's had to participate in an altercation that led to the bitterness that arose between them and JW or at least HR did. You know as close as the R's were that if HR was embroiled in a bitter custody battle the others would be also by virtue of that tight family relationship. By saying they may have been involved in drug trafficking is not blaming them for their own murders. You have to view this realistically. People sometimes make mistakes and get involved in things that are dangerous. Whole families are not killed for no reason.
As far as custody of SW goes, LM and wife are up there in age, GR is also, TR seems to be living in a campground as a single man, the sisters live out of state, we don't know much about BR but KR was a young girl trying to work and go to college besides being a second cousin to SW which would be viewed as a distant relative. We can assume JM was also suspect by the tracking device and BJM I don't think can take care of herself let alone a child as she had no definite job and KC has been rumored to have drug problems besides being involved in an earlier murder. JW is her father so he had first call on the custody issue. Because he may be suspected of having something to do with the murders won't hold up in court. In this country the court views you as innocent until proven guilty in a court of law. That's why the court gave him custody IMO.
JMO
Yes, they were still involved in a custody battle over HR's child, but I still disagree that they brought the massacre of their entire immediate family upon themselves because of it. Maybe some people feel better about an unsolved murder of 8 family members if they can find a way to say those victims could have prevented their own deaths, but most would probably disagree.
If the argument that Rhodens brought their deaths upon themselves supports the theory that locals or other family members killed them, it's only fair to offer some more evidence and arguments that explain why LE is focused on the W family and how the killing team developed their advanced murder skills and why LE and the AGO are still stumped and the federal agents are on the outside of the investigaiton.