You can use the same lame argument to crack down on violent Hollywood movies, violent music lyrics, etc all of which people can erroneously link to inciting crazy people to commit acts of violence. Yet restrictions on the 1st and 2nd amendment won't make our society any safer will it? We'll just be reacting in a knee jerk manner to limit the rights of sane people in hopes that the crazies won't find something else to set them off or use some alternative method to commit mass violence.