I think most recognized Adam Lanza as being disturbed with at least some, namely his mother, believing him to be potentially dangerous. So yes, it is curious why someone who believed that about her son would leave weapons within his reach.
>> “ So yes, it is curious why someone who believed that about her son would leave weapons within his reach.” <<
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I’m not son sure that we have any reliable evidence that she did that. The fact that she’s dead at his hand casts doubt on that scenario.