While not rational, it , it being Boston, and tax day, it could be a 'domestic terrorist'. It could be a lone lunatic, it could be an al-quida cell, or it could be someone inflamed by anti-government rhetoric.
I think some people's response , given the current level of information we have, is entirely inappropriatre, such as this Fox News commentator
'Muslims are evil. Let’s kill them all': US TV commentator Erik Rush provokes furious reaction with Boston bombing Twitter rants | The Independent | The Independent
™ Version 4.2
