From this article, it sounds reasonable. Three kids stole the car, and two kids help return it (and the girl, of course!). I can see the cops thinking they were part of the original three—maybe the two with consciences.
****From this article, it sounds reasonable.****
Reasonable is the cops get their address, contact information and let them go. If these kids were involved and had a change in heart, how does treating them like criminals get them any closer to the instigators? If they were part of the gang that was at fault and turned them in, both excoriate and praise them in public.
This country has stood against much worse and used both hands to deal its way through.