Usually you need to wash off (roughly) the bran from the rice no matter what you use to cook it.
Recently thanks to the technology, there's new kind of pre-treated rice that doesn't require washing.
It doesn't kill you if you didn't wash rice, in my opinion. it is not like it is dirty or something. It is just a matter of taste.
It's just this small amount of bran on the rice. If you want shiny white rice, then wash it. But I am not actually sure myself whether I can distinguish when I am served unwashed rice. Some of my friends say that the rice smells bran-ish when washing is not fully done.