Answers

2015-06-10T22:05:37+08:00
Its not computer science but the answer is there is emotional effect or agony in that person sometimes because of trauma? they past it in another person and sometimes there is pain that they want to  come out which turn bye hurting someone
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2015-06-10T22:06:00+08:00
Because they want to relieve their stress or they do it for their pleasure.
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