Many get more protein than the RDA of 0.8 grams per kilo of bodyweight (0.36g per pound of bodyweight). But the RDA can be seen as a minimum.

For people who exercise and try to build/maintain larger muscle mass the need increases. Studies often place their needs around 1.6g per kilo bodyweight, but higher amounts could be marginally useful. Athletes have even higher needs, and can consume 2g-3.5g per kilo bodyweight.

Lets say the average US american consumes 100g of protein per day. One average, that may be unnecessary high, but it all depends on your weight and exercise. I think people overestimate how much they exercise :)

short summary article on protein and exercise