I agree for the most part- protein isn't a problem, as long as someone is eating adequate calories from raw food. But if someone is eating too little food, then protein CAN be a problem... but that's something that can happen on any diet, not just raw.
I also want to point something out about the breast milk argument. I used to use this when people told me I wouldn't get enough protein- I'd say that babies only get 4% of their calories as protein, and they grow in leaps and bounds! But then a friend pointed out a problem with this argument: it's more accurate to look at protein consumed per pound of body weight, not as a percent of total calories, because it's body weight that determines calorie needs.
So if you look at a 10 lb infant, who needs about 800 calories a day, 4% of that is 32 calories from protein... which is 8 grams of protein.
So that infant is eat 8 grams of protein per 10 lb of body weight, which is 0.8 grams of protein per pound.
For a grown adult, who is 150 pounds let's say, this would be the equivalent of eating 120 grams of protein (0.8 x 150 = 120).
Now of course we're not growing, so we don't need that much :p But if you look at it this way, the breast milk argument doesn't work too well... because 4% of calories as protein actually comes out to be quite a bit, for a baby.