The Supreme Court issued two critical rulings. Although I am liberal I have always been pro-life and believed in self-defense. In the Bruen case the Supreme Court ruled that:
"New York’s proper-cause requirement for obtaining an unrestricted license to carry a concealed firearm violates the Fourteenth Amendment in that it prevents law-abiding citizens with ordinary self-defense needs from exercising their Second Amendment right to keep and bear arms."
If you wanted to conceal carry a firearm in New York--most notoriously New York City--the authorities could require that you proved "proper cause."
If the state didn't like guns, didn't think people of a certain race should have guns, or just didn't like you, then the state could deny you a concealed carry permit. The Court decision changes the "may issue" standard to a "shall issue" standard. New York must have objective criteria for concealed carry. People who dislike guns claim this decision will result in greater carnage.
Most other states including my own have "shall issue" standards. Legally armed conceal carry people are not the people murdering folks.