Well if we lived in a society where I lived in a place where I knew Mark for his whole entire life.....we should know how Mark lives..... if Mark started murdering people or fucking kids, one would assume the community at whole would know that Mark is the one who is murdering people or fucking kids.... murderers and pedophiles and people who do problematic things within a society should be spotted early on...... that's where Community is important... the community should know it's people, and it should know when it's people do weird or bad things, and it's Community should know how to reorient bad thinking into good behavior.... and if they don't adhere to good behavior they should be eradicated.