In America it's legal to own firearms (2nd Amendment) and a basic right. You also have the right to defend yourself and your property (Castle Doctrine). If its not legal in your country then its not, but it is in mine, end of story.
Crime exists in every country irregardless of its laws regarding firearms. Firearms can be involved in violent crimes just as knives, sticks, fists and genitals can be. Criminals commit crimes, tools may or may not be involved. Is there really any point in singling one out other than for political swaggering and/or scare tactics?
BTW go talk to a law enforcement officer about what their experience has proven to them to be the leading cause of crime. The answer will come back, Drugs and/or alcohol.