It is absolutely beyond any doubt that such killer games desensitise UNSTABLE characters and can have a stimulating effect
Yes let's not do something to detect mentally unstable people and treat them, let's ban games and leave mentally unstable people out in the community so their eventual victims can be safe in the knowledge that their injures weren't induced by games, rather than working towards a system where mentally unstable people are identified and treated so that nobody is injured/murdered.