So, the above means that even for most people on a standard cooked diet, the Escherichia coli O157:H7 is usually not dangerous at all.
It's not usually VERY dangerous. However to someone with a compromised immune system it might be. Nonetheless I doubt anyone here claims or thinks that purchasing grain fed meat and getting food poisoning from the e. coli 0157 is some how beneficial. If that were the case I'm sure people would be making high meat out of feed lot meat to trigger some sort of detox.
Being rather antagonistic, how would you combine them?
To quote your original post.
1.) The standard one, initially due to Louis Pasteur and implying that bacteria and viruses are our aggressive enemies aiming to kill us by propagation of contagious diseases. Isn't strange that non-really-alive microbes such as virus would have a will to achieve something? This concept leads to intricate complications in trying to explain why we are not all already dead in face of such omnipresent, innumerable, various and so determined enemies.
Of course all bacteria aren't harmful. But all bacteria aren't harmless either. When animal feeding went from a natural method (grass feeding) to a more unnatural method (feed lots) the types of bacteria those animals had became unhealthy. Pasture fed animals result in healthy bacteria, while feed lot practices result in dangerous bacteria.
Speaking exclusively of microorganisms, I know raw milk is a safe product when it comes from grass fed cows. But unpasteurized dairy from a feed lot cow is dangerous to consume raw speaking strictly about microorganisms.
In a natural setting where animals cared for themselves (ate healthy foods exclusively) and toxins were in naturally low amounts we'd come in contact with lots of healthy bacteria from healthy animals and healthy soil. That would be beneficial. Realistically it'd be wise to source healthy animals because unhealthy bacteria, viruses etc. from feed lot animals likely don't cause "detox" and actually cause illness.
Also, considering that humans have had such an unnatural diet for so long, and that livestock fed improperly results in dangerous bacteria. I think it's unwise to assume all microorganisms related to humans serve some beneficial purpose.