If all dogs are mammals, then all mammals are dogs.
A few months ago I met someone with similar logic. They said:
Every boy who plays video games gets addicted to pornography.
Their Bishop told them that every video gamer who comes into his office to repent, comes in for a pornography addiction. Thus, all video gaming boys get addicted to pornography. Now tell me if I'm wrong, but aren't most boys who are working with their Bishops today, working on pornography problems? It is a serious problem, running rampant in the world today. It is everywhere you look. You used to have to go to a store to buy it, but now all you have to do is grab the nearest device with internet. What about all of the boys who are playing video games who are not going to their Bishops, because they don't have a problem? It is perfectly possible to play video games without getting addicted to pornography.
Many people who are against video gaming seem to think that what they do with their time is tremendously better. Yet, what are they doing? Are they watching T.V. and movies? Are they reading books? The fact of the matter is, there is pornography available in the form of T.V., movies, and books too. It is just as possible to come across it there as it is in a video game. It's also possible to get addicted to T.V., movies, and books. We can not make assumptions and generalize things like this. You can play video games without playing games that are inappropriate. The same goes for what you watch and what you read.
Each of us have free time to spend as we please. We are taught to not waste all of our time doing good things when we could be doing great things, but we can only do great things for so long. It would be possible to read nothing but the scriptures, listen to nothing but the hymns, and watch nothing but the movies created by the Church, but I don't believe that is what the Lord meant for us to do. The missionaries of our Church are called to do just that, but they are only called to do so for two years. If we are having personal scripture study, personal prayer, and attending our meetings weekly, we are doing great things. If we are having family scripture study, family prayer, and family home evening, we are doing great things. If we are making sacrifices for others and serving those who are in need as opportunities arise, then we are doing great things. At the end of the day though, your time is yours. If we are all striving to heed the counsel of the Lord, what makes how I spend my time any better than how someone else spends theirs?
Finally, it is important to realize that movies, video games, and books all have a purpose and it would be wrong to say that one is strictly better than the other. What do they all share in common? They all are a means by which to enjoy a story. Time and study has shown us that everyone has different learning styles. Some are visual, auditory, or kinesthetic. Why is it so hard then, to believe that people may enjoy stories in different ways? I am most definitely not an auditory learner. I learn best through reading, thus, I enjoy reading my stories the best. I enjoy movies and video games, but books are my favorite. My husband on the other hand is a kinesthetic learner. He prefers to have things in his hands to understand them thoroughly. Is it so shocking then, that he gets the most out of his stories by being a part of them, acting as the main character? He enjoys movies and books too, but video games will always be his favorite.