They did the same thing as all of the others have done.
Did not obey the park rules and did not do what the park ranger asked him to do.
Asked?
That word implies politeness, which I strongly doubt was manifest in this example. I doubt it because this young man (the driver) doesn't seem the type who would behave rudely or contemptuously toward
anyone who approached him politely, much less a uniformed officer.
Does it occur to you that this Ranger might initially have engaged that couple in an exaggeratedly authoritarian manner which was entirely inappropriate under the circumstances? After all, what offense did this couple commit? Being a few minutes over the visiting time limit? Does that justify a vehicle pursuit, a potentially destructive vehicular action-stop followed by a demonstrative threat of deadly force?
That couple's "offense" called for issuance of a summons and nothing more. If their vehicle failed to stop for the Ranger's signal its plate number could be used to issue a summons by mail. What this Ranger did was excessive under the circumstances and would be acceptable (and lawful)
only under circumstances in which he had valid cause to suspect those people of some felonious offense.
There is a problem in that contemporary police, owing to a progression of increased police authority and aggressive procedures when making car-stops, have acquired the idea that their authority is omnipotent and that civilians may not under any circumstances disregard or disobey their
commands. This exaggerated impression of their authority has led to an infuriated response by some cops when a civilian fails to behave submissively toward them.
It is important to understand that the extremely counterproductive
War On Drugs is directly responsible for the rising conflict between the public and the police.