Does Watching Too Many Movies Numb Our Emotions?

I had this pretty interesting conversation with my mum about the effects of watching too much TV and how that affects people in reality. I found it such an enlightening conversation because at some point I was feeling that certain things in life didn't effect me emotionally as they used to, and I always thought that was part of growing up. It probably is, but the chat with my mum gave me another side to the story. We were discussing how nowadays you hear alot of stories of kids killing their parents, or students shooting school mates and teachers, or husbands killing their pregnant wives, etc. Its as if when anyone wakes up in the morning annoyed by someone, they just kill them, problem solved. The whole gravity of taking a life doesn't seem to be that drastic anymore. Its as if people got used to it, "whatever, so he died, so I lost my temper, so I got bored of hearing him whining and just wanted to make him shut up, so what?". Its as if we don't realize anymore that this is a LIFE we are talking about, and that killing is putting an end to someone's existence. I have even noticed myself not realizing the meaning of DEATH. You hear it on the news all the time; "100 people died in Iraq" or "a natural disastor took the life of thousands of people", that you automatically become immune to the effect the word "death" has on you. Plus you watch movies and dramas all the time with people dying, bleeding, turning into zombies, and even as a member of the audience you sit there demanding things to be gorrier, more dramatic, more death. You want more so you can get to the same effect you used to get with just one death. So when did one death in a movie become so unmoving that you needed more? When did 100 people dying in a bomb become unemotional that we know need to hear of thousands to shed a tear? When did blood become so easy on the eyes?