In terms of evolution, processed, supposedly 'best' food for dogs has only recently been around. Human guts seem to be best suited to our evolution around cooked foods extracting the optimum levels of energy from food, however, meat is disnatured during cooking, losing enzymes and vitamins, etc.
I don't think anyone's disagreeing that it's best suited for a dog to eat raw, and I consistently see weaning pups rip into raw meat products (human food), whereas there are breeders who have to use techniques to getpups eating processes food.
I do think there is a widely held belief that all these pathogens don't exist in processed dog foods. The meats used I doubt are the quality I use, and are from offal (the thing you say is a single high contributing risk factor for pathogens).
Mars have recalled over 100 of their brands for widespread contamination.
New York residences are full of mice crapping salmonella and distributing it everywhere.
I belief the pathogens are more present in intensely farmed (i.e. not fed their natural diet which combats a huge proportion of development of such pathogenspathogens)
The issue is the source. If you stuff cattles guts (evolved for grass digestion) full of corn to fast rear them, and produce poor quality meat, the meat itself will carry higher loads of pathogens.
People eat all forms of raw meat all around the world, the key is the quality. In the states for instance where there is high prevalence of corn feed protocols, meat is also treated so it doesn't turn brown with deterioration (carbon monoxide). It will look pink when it dangerous to eat. These kind of poor practices bring the risk to your home. Most of the infection you will get from commercial food establishments, or as I did, travel to remote places, and contracting both campylobacter and salmonella. I wasn't well! But good gut microbes deal with it.
A high protein diet for a dog plays to their gut design and microbe environment. Mixing diets causes massive imbalances as does carb content, and resultant obesity.
I we carry all these pathogens that cause illness, and so do animals. Our guts, their guts. They are everywhere already is my take, and feeding my animals another way will cause problems for their lives afaik.
I cannot quote you all the research, papers, books and regimes I have studied and reviewed, as well as the decades of experiences of other breeders I know. Particularly the breed specific ones.
As an aside, I would never need large cooked bones either. They do snap into very sharp points and I dont use weight bearing bones. A 'wellwisher' decided to feed cooked bone to one of mine. I had no idea this had happened. I became concerned about one of my ddog's behaviour generally and specifically eating. It wasn't obvious what quite was the issue. Only when I found out what had happened I immediately drew the link and check ddogs mouth/throat/teeth and found a massive sharp sliver driiven hard into gums between the two rear top teeth!
The safest thing I think I've given for purely knawing purposes has been antlers, but maybe someone will come along and tell me otherwise, then I'll think again.
Ddogs are supposed to eat partially digested grass, like that within the stomach of scavenged animals, rabbits, etc. As well as the reason they eat rabbit, sheep, cow and horse poo. They are the most bacteria ridden disgusting feeders! Even if you don't give it to them yourself. They will dig for soil to eat and graze on grass. Not to mention the foul unmetionables they roll in and walk through, pick up in puddles, eat rotting birds etc. Just gross and riddled with it. Read an interesting article on the neutralising of e.coli etc by vultures recently. Also, what you put in will transform the guts ability to destroy, by increasing the acidity in the gut. This can happen within weeks of moving to raw.
I think its pretty much always possible (within reason) to find research findings that corroborate the outcome one seeks. I don't even think there are even now definitive articles, or sufficient meta analysis.
In other news its reported that ddogs are harbouring increasing variants of the influenza virus - providing a means of transference from pigs to humans, the next major flu pandemic! Potentially.