Edit: Original site is paywalled and seeming to not always load, here is another article about the incident: https://www.nbcnewyork.com/news/local/united-airlines-flight-masturbating-incident/6551525/
Edit: Original site is paywalled and seeming to not always load, here is another article about the incident: https://www.nbcnewyork.com/news/local/united-airlines-flight-masturbating-incident/6551525/
Snagging him right at the arrival gate seems pretty reasonable, and certainly security has done so after flights for many various offenses in the past.
But yeah, at the very least they should know who the guy was and be able to provide information to the authorities in order to press charges.