This doesn't even make any sense. Sandy Cliff? I'm assuming you mean Sandy Hook but there was never any mention of "terrorists". It was one mentally deranged lunatic who had some wild theory for avenging any wrongdoings committed against him. For the sake of civility and everyone's sanity in this community, let's keep these "biggest mistakes" related to legitimate debate points (such as taxes, social security, medicaid, etc). Try to refrain from wild conspiracy theories and other anti-America sentiments.. otherwise, the topic will just be deleted.