Treatment of those from overseas presenting themselves at US Immigration, and the zealous visa procedures beforehand, is widely felt to be a significant reason why Chicago lost the 2016 Olympics to Rio recently. It will be interesting to see if this analysis reaches up to the US President, who devoted time to the bid, and what in turn comes down from this.
Any nation is justified in appropriate measures at their border. This does not include widespread arrogance, rudeness, xenophobia and ego tripping by the staff, and acceptance of same by their management.
Do I understand that US border control positions are a job of choice for ex-US military personnel, enlisted rather than officers, and they bring their US military attitudes with them.