Video games
The way I see it
considering the Mirror Neurons in the human brain have a unique purpose involving mimicry of behavior,
founding a phenomena within our minds in that we "assimilate" our own ways to behave through the behaviors of others we observe,
which range from assimilation of archtypes to that of minute behaviors,
it shouldn't be much of a far cry to expect that individuals can be "programmed" as such through the characters they observe,
regardless of the "reality" of the character,
for example characters in myths, stories, history, movies, CELEBRITY, etc.
Further, the minds of youth are both malleable and incomplete in the "jading" borne of experiential maturity and scrutiny of the world around them. A weak mind is always more prone to being manipulated outside of it's own awareness. This at the core of why we see quite a number of people mimicking the clothing styles of their favorite celebrities, for example.
This is why I choose not to allow my young children to play games like Fortnight, their minds are not ready to entertain the concepts without assimilating them. Too much of a future risk.