I find that brandishing a camera has some effect. It won't stop arrogant people, but it may make a simple idiot apologize and/or think about the next infraction. Unfortunately, the one time I turned over photographic evidence of a violation similar to your example, I never heard back from the ranger, so I don't know if it worked against that arrogant person, or not.
There’s not a great deal you can do. Many of these miscreants are armed and under the influence of alcohol or other drugs. With the financial constraints law enforcement is currently under in most places, there are just not enough officers, rangers, deputies available to cite the offenders.
The camera or video camera is a good idea. Forward it to the proper authorities with the offer to submit a written statement and/or swear out a complaint.
A few years back, I did manage to rid an area of some fools by looking directly at them and making a cell call to Law Enforcement. They had the brains to realize that I was reporting them. The call didn’t connect, but they didn’t know that. They left hastily while I grinned.