I’m a psychology student and I can tell you now that, in varying levels, TV does influence our perception of crime.
Its not just CSI; the news, books, video games all numb the horror and magnitude of crime. It glorifies it in a way which makes us stop ‘feeling’ in a way. People read books about abuse victims, and watch shows about murders and they stop feeling empathy for the victims because they are over exposed to it. When was the last time you watched an episode of CSI and felt true empathy for the victim?
I know it’s only a TV show, but it’s designed to reflect real life (in a way) with regards to the fact crimes like this actually do occur. It can take away from that.
However, I also think crime shows can positively affect people. When the shows show the ‘correct way’ to handle thing at a scene, it can be beneficial to the viewers. Like how not to panic if cornered by an assailant, how to make sure someone knows something is wrong if you’re being attacked. Little things like that can be picked up and learnt subconsciously though repeated viewing of shows. Even if you’re not aware you know them, your brain would be able to pick out things to help you if ever placed into a situation like that.
It also reinforces belief in police departments and the justice system. If we are continually bombarded with images of people reposting rapes, and officers solving murders, we begin to believe if it ever happened to us, someone would most certainly help.
Truthfully, I’m here to say yes, TV (CSI, with regards to your original question) does affect my, and others, perception of crime.
Hope that helped you somewhat.