Violent Media Numb Viewers to others' pain

More evidence that gigo applies to the human mind: violence and uncaringness viewed creates a numbness to others' suffering. The overview is here: Violent Media Numb Viewers To The Pain Of Others and a quote to give you the flavour: "'These studies clearly show that violent media exposure can reduce helping behavior,' said Bushman, professor of psychology and communications and a research professor at the U-M Institute for Social Research.
'People exposed to media violence are less helpful to others in need because they are 'comfortably numb' to the pain and suffering of others, to borrow the title of a Pink Floyd song,' he said."
Now the question really is whether the methodology allows the claims; the results look pretty conclusive.