Where are the families, churches, schools, and social organizations in helping the players of these games in understanding right from wrong?
I am not calling for censorship in any way, but our society has failed in recent decades in communicating appropriate ways of dealing with our anger, pain, frustrations, and even hate. When you leave a void like that other influences will fill the vacuum. Each case is different as to what opened the door to this, but the evidence is clear as to one source of filler material.
I would much rather change this emotional cry to repeal the Second Amendment to a movement of sound child rearing. Full enjoyment of the First Amendment, full enjoyment of the Second Amendment, and happy families enjoying all things in moderation. However, if we are not going to recognize the facts we are our own enemy when it comes to supporting those trying to take our Second Amendment protections away.
Are guns the problem? No.
Are video games the problem? No.
Is curiosity concerning tools and technology natural? Yes.
Can we expect undeveloped minds to understand right from wrong and to act in a proper manor without direction? No.
So, where do we put the blame? I choose the social structure that puts its children in front of media with no parental nurture or support.
Early in the life of television families would watch an informational program together. When the program was over they would turn the set off and discuss what they watched. This was an extension of normal life in the era. However, as a business television executives learned that they needed the sets on with viewers if they were going to sell advertising, so they kept tweaking their programs until it became a non-stop excitement fix that eliminated quiet time and family time. The evolution continued and grew.
Combine this media evolution with the break down in the American family, and you have an seed bed waiting to nurture anything that comes along. In recent decades much of this seed has come in the form of rapidly expanding violent technology. Combine this new technology with broken family and community structures, and a useful tool (gun), and we wonder why people blame us for violent actions committed by bad eggs.
After that lengthy and audience losing introduction, the direct answer to your final question is that the games do not force anyone to act. But, they do cause those with some other issue to react in a way that the game has taught them will be rewarded.
I don't have the answer for society as a whole, but I do know what I do to avoid this. I support family activity and closeness, I support community recreation of all types that includes all ages and abilities in a way that shows both loss and gain, I support church activities that reinforce morals and values, and I make sure that desensitation is replaced by the knowledge that every action good and bad has an affect on others.