Well, yeah, entering the US as a non-citizen is a privilege granted at the discretion of the US federal government. Border control is an essential function of a sovereign state.
>I also find it a bit disturbing how easily you apply law & order in the name of a country that was not involved in deciding the validity of that decision or the circumstances behind it.
It's disturbing to not want criminal elements freely entering your country? If they're a not refugee and they can't follow the law in their country of origin, why should any other country be obligated to let them in?