Originally, the Bill of Rights only applied to the federal government, not the states. It wasn't until the Fourteenth Amendment was passed that certain amendments started getting "incorporated against the states," meaning that they applied to the states as well as the federal government. For instance, it wasn't until Near v. Minnesota in the 1930s that the Supreme Court held that states were limited by the Fourteenth Amendment in their ability to institute prior restraints on the press.
That didn't happen to the Second Amendment until McDonald v. City of Chicago (or arguably DC v. Heller, but McDonald made sure everyone knew it) in 2010.
Constitutionally speaking, the Second Amendment has never been stronger.
(I will post a link to a chart)
Chicago murder rate has been flat from 2004 to 2014, had a small uptick in 2015, and then a massive surge, aka going from 15 murders for 100,000 people in 2014 to 27 murders to 100,000 people in 2016
https://fivethirtyeight.com/features/chicagos-murder-rate-is-rising-but-it-isnt-unprecedented/
Are you familiar with any study that was able to establish a casual link, or even suggest a link, due to the actions of McDonald v. City of Chicago (2010) that was further litigated in Moore v. Madigan (2013) and then the Illinois state legislature had to deal with Moore v Madigan and they decided to start concealed carry in Jan 2014.
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Note I am not saying I think there is evidence or there is not evidence, I am just stating the data is enough that there is a correlation to the point that this issue should be studied and I really do not know the answer, nor do I pretend to guest. Me guessing right now is something I consider bad science, but the data is interesting enough to generate a hypothesis and ask for more data from trained experts.
Pretty much I am curious if you have heard anything? A murder rate increase from 15 to 27 per 100,000 is a big uptick, but as the 538 piece pointed out this was actually in line with the late 90s and prior decades for Chicago.
Also I recognize their is far more things going on than a single law that can impact the Chicago murder rate in the area of Chicago.