He made a threat.<p>I think it's in bad taste to make public bombing threats, even as a joke. It's just not respectful to the people who have to dig through this shit and interdict the real bad guys. As societies, we have limited resources with which to investigate threats that are made, and our governments have an obligation to investigate each and every threat that's made, even jokingly on Twitter.<p>The reaction is totally over the top, granted, and I'd rather they spend their time interrogating trust fund Nigerians recently returned from a Yemenese vacation, but there should be a penalty for making joking bombing threats, in the same way that you shouldn't go around yelling 'fire!' in a movie theater.<p>Criminal prosecution is ludicrous, though.