I would not rule out scavaging some of the meat. It would really depend on how badly I needed it and what the environmental conditions are like.
If is is a deer in the winter-time, dead and partially frozen, I would probably harvest some meat from it. If it were in the summer, I would be much more hesitant and likely forage for something else first.
Anything bloated, seeping, in the water, maggot infested or has an overpowering rank smell would be a no-go for me.
Although I am a bloody-steak person, anything I scavenge would definately be well done before I ate it.
BTW--people eat rotten food all of the time--cheese for example is mold. kim chi (a korean salad) is made of spiced/fermented cabage. Alaskian Inuits eat stink heads (rotten salmon heads), The folks in Iceland eat fermented shark. Most of us have drunk beer or wine and the Phillipinos eat a rotten duck egg (bulot). Don't forget the high dollar Kobe steaks--it is rotten meat (they call it "aged"). The same with hams and Iberian proscuito.
Only our individual cultures dictate to us what we can or cannot eat. Remember, us humans are omnivores. We can eat most anything. The trouble for most of us though, is that we have forgotten or just never learned what and how to eat something if it did not come out of a box, package or is not plactic covered meat.
Hell, most people would not know what to do if given a bag of flour, a whole (undressed) rabbit, a package of yeast and some oil then told to live on it for a month.