That is because they do not answer the single most important question to all involved. Regardless of which side of the fence you are on, it all comes down to the question of YOUR OWN personal safety and that of your loved ones. Any argument that does not address this question will fall on deaf ears. With that in mind, let me demonstrate conclusively that any restriction placed upon gun ownership is not only contrary to your best interest, but does in fact, increase the likelihood that you or a loved one will become the victim of a violent crime. Think about the significance of that one simple fact.
Criminologists are the experts who study crime, criminals and their motivation.
They collect and analyze statistics surrounding crime and the tools of crime. These are the people who make it their business to know and understand how, when, where, why and by whom guns are used. And, like anyone in any job, they learn more as they grow in the job. The mere fact that the more a Criminologist learns, the more likely he will be to oppose gun control, should tell you something. Criminologists who started out supporting gun control are having to face the fact that gun control has not worked anywhere that it has been tried and that you are safer in a society where guns are not restricted, than in one where gun control laws are in effect.