I was exploring around outside of Whiterun, I came upon a camp with giants, so I walked up to get an up close look at the giants thinking they weren't hostile. Boy was I wrong, the giant I walked up to kicked me right in the face and killed me. I could have sworn Todd Howard said in the E3 demo that giants weren't hostile unless provoked, but I guess not.

There's your problem right there. Look at them from Faaaaaar away

:3

if you encounter them in the wild they aren't hostile, but in kamp, they protect them self i think.. cus i was killed to by a camping giant. But when i walked beside a giant and his mammoth in the wild, nothing happend..