I've had similar experiences with foreign family members attempting to visit me, a US Citizen. It's just a roll of the dice, no matter how prepared you are, no

I've had similar experiences with foreign family members attempting to visit me, a US Citizen. It's just a roll of the dice, no matter how prepared you are, no matter how much evidence you have. It's all extremely subjective. Despite what the US immigration authorities think, not everyone wants to give up a well-paying job and universal health care in their home country and move to America to take an illegal cash job as a dishwasher.