Here we observe the natural territorial behavior of the Airlinneus subspecies of Homo governmentus, commonly known as the "TSA agent" or, more broadly, "G-Man." Unfortunately, a young female Homo sapiens and her mother have mistakenly wondered into their territory and the younger appears confused. She has been taken as a threat, and a fight ensues. This species is known for its aggression, and, like the grizzly bear, usually responds better to submissive behavior. Watch as they group together and work together to expel the apparent threat to their territory... Marvelous... The lighter skinned one is able to hold back the older female by his force of persuasion and intimidation alone, while the darker skinned subject is removing the threat by force, attempting to actually restrain the subject. Ahh... what a remarkably intelligent trait...
What... you mean we're not watching a nature show?

Now tell me what government agents have largely done throughout history, not just American-- HUMAN history? Their job and what it entails? Now tell me how they tend to naturally behave and think?
Yeah... g-men are trouble... plain and simple. If you need their help, good for you. Just hope they don't turn on you. They're agents of the government, not your friends. Just hope the ones you deal with have enough good and humanity in them to treat you right when things get tough.
They're people... with power and authority... a job that entails restraining people and delivering them to judgement, by force if necessary. Like grizzly bears, they generally become only more aggressive in response to aggression. Like killer bees, when you piss 'em off, a thousand more will follow to finish you off. People make mistakes and do bad things. What happens when you take normal people and pump them up with power and authority and expect them to execute all these laws and such? It ain't pretty, folks.
Those agents had better be thankful that they were dealing with a mild-mannered mother and not a hot-headed father, or this would have turned out a lot uglier. I wouldn't really blame the father either.