I purposefully didn't as it wasn't directed at me, and I felt it was too far from the original topic to delve into. But, to try to apply it, the metaphor itself is a bit hazy/unsatisfactory within our society (comparing dog to human, just doesn't really get to the meat of the issue). That said, we already do things like medicate and treat people with disorders and mental illness. This is especially true if you can catch it early and/or convince adults to go in for treatment, but is not limited to that (ie. there is 'involuntary' or 'assisted' commitment).
Adults suffering from, say, bi-polar, will often enough stop taking their medications during their manic phases. If the onset happens or if you catch it while people are still minors, clinical treatment becomes a lot easier to put in motion. If you can catch it even earlier (ie. identify a gene), you are looking at even more options as we have become quite adept at turning genes on/off, splicing in or removing sections of DNA, etc. If you can identify what organic/gene combination triggers schizophrenia, you may not have to look at treating it when it emerges later in life...or letting it go untreated. If you can identify what injuries and areas of damage to the brain will result in criminal behavior/aggression/poor behavioral control, you are looking at treatments for that at the time of injury, and you are learning what to identify for it/what to look for. In the case of criminals, you are looking at better chances of rehabilitation, because yes, many prisoners do prefer a chance at a 'normal' life versus being in a stressful, forced environment.
In relation to the topic of violence begetting violence as it were, if you can prove it happens, can observe how it happens, can see what species it occurs in, can study exactly what is happening within the brain and body...you have the building blocks to better understand what sort of effects abuse has on people at both the mental and physical level, and also can best choose animal models for resulting testing. It may very well be that stress/reactions to aggression/etc. has effects on what neurological pathways are formed, or that it actually changes the brain structure (ie. hippocampus size correlates with clinical depression). As zooarch mentioned:
Often times all the studies that don't seem to make sense are building the knowledge so that a larger conclusion can be drawn. You also need to have these developmental studies to add to the qualitative studies that focus on behavior.
I hope that helps address your questions regarding why resulting treatments do not just equate to involuntary commitment...and how they can in fact prevent that by understanding and then preventing biological and environmental triggers that lead up to incarceration based on violent behavior (as opposed to say, being caught with the wacky weed, which is another discussion entirely).