Point out to her that people thousands of years ago still did terribly brutal things without video games that would "influence" (read: be used as an excuse for their undetected mental disorders) such behavior.
The Ancient Romans were one of the more brutal ancient cultures. Their idea of fun was to watch boxing, but not our modern boxing. Each participant was tied, sitting down to a stone block only a few inches away from the other man. Then each man would wear steel gloves with long spikes on the knuckles and they would fight to the death.
The Romans would also throw unarmed slaves into a fight with a lion or some other wild animal. Guess who died on the ground with their entrails scattered around them?
In one of the after battle ceremonies after gladiators would fight, a man would come out dressed as Hermes with a huge stone hammer and smash all of the dead people's skulls to make sure they were dead, and this resulted in a large amount of grey matter on the ground.
A Roman gladiator, in an unarmed fight with another, once pinned his opponent to the ground and dug out his intestines with his fingernails and ate them right there in the arena, while his opponent lay on the ground dying considering he had a giant hole in his abdomen which was gushing blood like a geyser.
Bring these stories up, because the Romans had no video games yet they still watched/performed these acts. I could go on and on about brutal customs before video games.
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