I agree and I want to clarify that Snapchat/Instagram/Twitter have created an amplification such that while kids may have done stupid things in the past, they are more likely to do it for an audience of their peers. The most mainstream example being YTers like Jake Paul who has taken MTV's Jackass into the New Media age. The less common examples being kids who are so self absorbed in their own world that they fail to take responsibility for what their actions incur. It is possible these teenagers who started the fire will escape consequences and (modern fire prevention techniques aside) the true tragedy is that the actions of a small group of individuals have affected the larger society irreparably. Like a jackass motorcycle rider weaving between cars on a major highway at 100+ mph, it is when your actions affect innocent bystanders that you are no longer just "selfie expressing".

Well at least nowadays, they're more likely to self-incriminate.