[gtirloni]

The police and the DA are afraid of this kid being a real threat down the road. They imagine that if what he said really happens, they will lose their jobs and have some very bad publicity (because the US society expects that it can avoid all and every crime so it moves the machinery in that direction adding more stupid laws, more law enforcement, more spying, etc, etc, etc). So for the Police and DA it's much easier to throw this kid in the jail and, if it was a mistaken, then 1) they can say they were overprotectice and 99.999% of the population will thank them for it and 2) the fat paycheck for this kid will not come from their salary.

If the police officers and the DA to get booted from their jobs for this mistake, then some other public figure / wannabe politician will use the current society paranoia state to point at the elected officials and say they don't care about people's security and blablabla.. the masses let it all happen and the policitians need the masses.

We're in a sad state of affairs these days but I suppose it has always been like that since before humans even started to talk.