Oh no, I get all of that. But DHS is DHS as far as I care.

If they sincerely thought that these people were a threat they would have been detained. They were not worried in the slightest however, and nobody "seemed like trouble". The agents were just being assholes.

You see, the extent to which they posed a threat to the country they also posed a threat to the aircraft. (Not in the slightest, and everybody involved knew it.)