Regardless of who you are no one has the right to enter another country.
That's what America is, another country. You're not crossing from Saskatchewan to Alberta here.
The border guards both ways have seconds to profile you and decide if you pass, or if you get searched or just turned away. They use a very quick and crude method to decide what happens next.
Unfortunately for some people the term shit magnet is the only fair description. I have friends that I would not cross a border with in any circumstances. Something about them just begs for quiet time in the little room. For other people who may have lead a more sheltered or privileged life suddenly have a large unpleasant person prying into your life seems like a horrible injustice. It's not going to change.
Airsoft, where nothing is hurt but feelings.