> The defendant, Preston Thorpe, appeals his conviction for possession of a controlled drug with intent to sell
He may have done other things, but his conviction was for possession with intent, and that seems to be why he's locked up. It doesn't make anything else he's done acceptable, but in America he's innocent until proven guilty, and it doesn't seem he was found guilty of assault.
However, on any individual case the same is not true, because that moves from talking about averages and general cases into specifics, and the burden of proof changes significantly. While there is a connection on average, that isn't enough to say any specific drug abuser commits domestic abuse. For that, ideally, you need criminal charges proven in court. That's missing here.