Video games allowing teens and young adults to kill people for sport and entertainment is desensitizing our culture. By allowing this trend in gaming to continue, we will see more tragedies occur more frequently. Please force gaming companies to have some sort or moral value in the games they create. Killing is not entertainment.
In psychology, desensitization is defined as the diminished emotional responsiveness to a negative or aversive stimulus after repeated exposure to it.
People should not be cheering when they kill another person. A person should not find enjoyment upon entering a school, movie theater or mall and start shooting random innocent people.