Knives were used more often during the commission of a homicide than rifles, shotguns, blunt instruments, poison, explosives, fire, narcotics, drowning, strangulation and asphyxiation combined in 2013 according to FBI crime statistics for the United States.
Knives cause more fear in victims when they are seen; the presence of a knife instantly conjures up pain, blood and an extended process of death– the victim has time to think about it. A knife is said to be the preferred weapon of choice for sadistic serial killers– it makes sense because the goal of such killers is to cause extreme fear.
It is quicker to kill someone with a knife, if you are within 20 feet of the target than it is to draw a weapon on them. It is also harder to disarm a knife-wielding killer. Knives are silent and do not cause a ruckus. Victims are more likely to remain noiseless when a knife is brandished because of their unadulterated panic.
Knives are at your fingertips, unregulated and present everywhere. Guns are already heavily regulated, with no meaningful impact on murder rates, and such restrictions on knives would make even less sense. There are, however, laws that limit the length of the blade that can be lawfully possessed. Also, many states and federal statutes increase penalties for offenders who possess a knife during the commission of a crime, in some cases, imposing mandatory minimum sentences. But at the end of the day, no amount of restrictions will stop a determined knife killer from making a visit late at night and leaving undetected.