What are some reasons why violent video games cannot lead to violence in real life

There should be no reasons. As a parent, you should be able to tell if your kid is mature enough to handle the violent game without it transferring to his life. Just read the back of each game, there is a MSRB rating showing whether your kid is old enough for the game. If you think video game violence truly made your kid violent, your wrong. It is all about the parenting.