Thank you for accepting the challenge!
I'm arguing that banning guns will not reduce crime rates in the US. My reasons for believing this are as follows:
1. Russia and Mexico's gun ban
[See source 2 for graph]
In Russia and Mexico firearms are banned, and the murder rate is significantly higher than the US in comparison . A study from 2007 published by Harvard University claimed that more control over firearems doesn't necessarily mean fewer serious crimes.
The Harvard authors of the study wrote: "If more guns equal more death and few guns equal less death, areas within nations with higher gun ownership should in general have more murders than those with less gun ownership in a similar area. But, in fact, the reverse pattern prevailes" .
The research published by Harvard shows a direct correlation between lower gun-related incidents and less stringent laws.
2. Australia's gun ban
In 1996, following a mass shooting that resulted in 35 dead, Australia applied a gun ban. Following this, there was a small spike in murder that then leveled out to what it was before the gun ban [refer to source 4 for the graph].
3. The United Kingdom's gun ban
Also in 1996, the UK enacted its gun ban. Prior to this ban, "the homicide rate fluctuated between 10.9 and 13 homicides per million. After the ban was enacted, homicides trended up until they reached a peak of 18 in 2003"  [refer to source 3 for graph].
4. Guns are often used for defense.
Research has shown that guns are used thousands of times each year to prevent crimes .
"In October, a man walking in Westlake Plaza used a gun to defend himself against a violent assailant who had punched and kicked him to the sidewalk. Only the fact that the victim carried a handgun saved him from serious injury or death (Seattle Times, October 10th).
"Also in October, an intruder forced his way into a Texas home and tied up a mother and her 14-year-old son, threatening to kill them. The son was able to get free, retrieve a handgun in the home and shoot the intruder (Fort Worth Star-Telegram, October 9th).
"In Denver, a man with a long history of violent crime forced entry into the home of a local schoolteacher by prying loose a window air conditioner. The teacher, using a shotgun, fired on the man and ended the attack (Denver Post, July 20th).
"In 2002, a West Seattle man used his roommate’s handgun to end a violent assault by an intruder who had broken into his home (Seattle P.I., April 26th)."
[Refer to source 5]
With as often as guns are being used as self-defense, banning them would only result in 37% of the American public  being made defenseless.
5. Criminals don't follow laws.
A crime can be defined as: "an action or an instance of negligence that is deemed injurious to the public welfare or morals or to the interests of the state and that is legally prohibited" . As such, a criminal is someone who is "guilty of crime" .
Criminals don't buy their guns legally or through the government, but rather thorugh unregulated ways.
At the Chicago Crime Lab, private interviews took place with select inmates who had criminal records involving gun crimes. "Most said they’d put their hands on a gun within 6 months or less of their release from jail and that they would most certainly not get their guns through legal channels...About 70 percent said they got their guns from family, fellow gang members, or through other social connections. Only two said they bought a gun at a store" .
Thank you for reading.
IvanOberfetwebel forfeited this round.