"Media violence induces imitative violence.
If true, this idea is dangerous for at least two main reasons.
First, because its implications are highly relevant to the issue of freedom of speech.
Second, because it suggests that our rational autonomy is much more limited than we like to think.
This idea is especially dangerous now, because we have discovered a plausible neural mechanism
that can explain why observing violence induces imitative violence.
Moreover, the properties of this neural mechanism — the human mirror neuron system —
suggest that imitative violence may not always be a consciously mediated process...
human mirror neuron areas are critical to imitation.
There is also evidence that the activation of this neural system is fairly automatic,
thus suggesting that it may by-pass conscious mediation", edge.org