From all my similar experiences - and having always followed the rules to the letter… the reason is often just “because I can do this to you”. One officer basically said that to me… “I can mess this up”.
@Janet - you have done a great job of detailing a lot of the frustration, needless drama and difficulty involved in the green card process.
It was hard and expensive (for my boss). I started here on a work visa and thought it would be a short stay - but that changed. We jumped through all the flaming hoops to get things done. I was screamed at - SCREAMED at - by irate border officers who were pissed that I was “stealing a job from a fine American citizen” (their exact words over the years). I had officers bang on the counter and yell “what makes YOU think I should allow YOU into MY country??!!” (another phrase I often heard - directed at me and many others).
I had one officer refuse to let me back into the US after a trip home for a funeral… I had learned by then to never react or ask questions - because that is what some want. Nod and smile. Yes sir. No sir. I had to turn around and spend the night in a motel… so I could go back to a different crossing an hour away in the morning with the exact same paperwork (all done correctly) and have no issues getting home.
Sometimes I think that if I had know ahead about all the stress and expense that was involved in the process… I would not have done it. But then I would have missed out on many adventures and friends…
I did everything right. Every. Single. Thing. And it was difficult even for a white woman.
So when I hear people Out There breezily saying… well, illegals should just become citizens… as if it was so very easy… … I want to write them out a reality check.