I don't normally reply to stupid, dishonest arguments, but since you asked.
You never supplied any explanation for why gun control laws are not enforced in Chicago.
They aren't enforced on the federal level in the nation as a whole:
FBI denials referred to ATF DENI Branch 76,142
DENI Branch referrals to ATF field divisions 4,732
Not referred to field, overturned, or canceled 71,410
Cases declined by ATF 4,184
Charges referred for prosecution 62
2010 charges that resulted in guilty pleas 13
https://www.ncjrs.gov/pdffiles1/bjs/grants/239272.pdf
They aren't prosecuted by the city of Chicago/Cook County:
"From January 2006 through August 2013, thousands of cases involving a weapons violation were thrown out in Cook County’s criminal courts, The Chicago Reporter found. More than 13,000 cases that included a gun violation have been dismissed during that period, shows the Reporter’s analysis of records maintained by the Clerk of the Circuit Court of Cook County. In fact, more felony cases involving a gun--from illegal possession to unlawful sale to a felon--have been thrown out than cases with any other type of charge."
Thousands of felony gun cases are being dismissed in Cook County criminal courts | Chicago Reporter
"Since 1982, when the city tightened its gun ordinances to include the handgun ban, there have been just 2,201 convictions under the laws, according to data obtained by the Chicago News Cooperative from the office of the Cook County Circuit Court clerk. That works out to an average of about 79 convictions a year."
City’s Restrictive Gun Laws Are Rarely Enforced - The New York Times
Of course, it isn't just gun control laws that aren't enforced. In 2015, just 26% of murders committed that year were solved, with an overall clearance rate of 48%, 14 points below the national average.
https://www.dnainfo.com/chicago/201...-solved-just-26-percent-of-472-homicides-2015
They have fewer resources to solve crimes:
"The number of detectives on the Chicago police force has dropped to 922 [in 2015] from 1,252 in 2008". That's a 26% reduction.
Chicago's detective force dwindles as murder rate soars | Reuters