Do you know dangerous people?

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I am from the kind of peacful people,but the life is not that peacful around us,so i know some dangerous people,ofcourse they are a good people but with a touch violence and some of them went to jail sometimes,but they are good with me and i proud of them,sometimes when i fall in a trouble and the peace doesn't work i call them for help and beleive me they are very useful. So do you know a dangerous people?and do you consider what i am doing is right??!!