Stupidity is tsn't quite the right word.....
In a 2014 report, the Electronic Frontier Foundation awarded Snapchat a single star (out of a possible six) for its lax protection of user data from government requests. El Reg reckons that the EFF didn't take end-users' stupidity into account.
The police didn't even have to make a request to Snapchat. Someone on his Snapchat list turned him in. This is beyond stupid.