From theory, action.

"The psychologists call it “deindividuation”. It’s what happens when social norms are withdrawn because identities are concealed. The classic deindividuation experiment concerned American children at Halloween. Trick-or-treaters were invited to take sweets left in the hall of a house on a table on which there was also a sum of money. When children arrived singly, and not wearing masks, only 8% of them stole any of the money. When they were in larger groups, with their identities concealed by fancy dress, that number rose to 80%. The combination of a faceless crowd and personal anonymity provoked individuals into breaking rules that under “normal” circumstances they would not have considered. Deindividuation is what happens when we get behind the wheel of a car and feel moved to scream abuse at the woman in front who is slow in turning right. It is what motivates a responsible father in a football crowd to yell crude sexual hatred at the opposition or the referee. And it’s why under the cover of an alias or an avatar on a website or a blog – surrounded by virtual strangers – conventionally restrained individuals might be moved to suggest a comedian should suffer all manner of violent torture because they don’t like his jokes, or his face."