It's "clout culture" combined with poor parenting. They see other people doing it and they want to be part of the in crowd. Because they were never taught critical thinking skills they never stop to think "If my dumbfuck buddy Kyle can see this so can the cops".

When I was growing up I learned to assume everyone is a cop, as a result I made sure no one was looking (even my dipshit peers) before I did something potentially ruinous.