No. They need to be charged with aiding and abetting terrorists. Trying to confuse, disrupt and over burden anti-terror security resources is a direct act of support for terrorism.
"We ought to send the bill to their parents for any damages their Me-ocratic tantrums cause."
Who's going to pay the "bill" when the bastards tie up security and AQ slips a real bomb into the convention and kills hundreds. Do you suppose these anarchists even considered the fact that their actions could kill people? Or maybe they just don't care.