I agree with you on all but your last sentence. If you could magically remove every gun from the US, then yes, you'd obviously have less gun violence. If you could magically remove every car you'd have fewer drunk driving fatalities. Neither addresses the actual cause, only the method. We ALL want to see these shootings end. We just disagree on how to make that happen.
Other countries also have deranged people getting antagonized and worked up in echo chambers, but there are a lot of differences in all those places in cultural, ethnic, political, mental health use, law enforcement, and etc. I pointed out a month or so ago that if you remove the shootings from a handful of large cities in the US, our gun violence rates drop to some of the lowest in the world. The vast majority of shootings take place in overcrowded cities with overwhelmed mental health services, judicial systems unable or unwilling to remove and keep criminals off the streets, and high levels of gang/drug activity. Joe Average living In the rest of the country rarely if ever commits such gun violence, yet he's who you want to disarm.
How can you look at Chicago and then think more restrictive laws are the answer? That's like the old saying about doing the same thing but thinking you'll get a different result. It doesn't work in Chicago or Detroit or Los Angeles or Philly or DC or anywhere else in this country. Criminals gonna criminal. They'll get them from Mississippi or Indiana or wherever, and if you close off those sources, Mexico will gladly take up the slack.
Do you want to actually eliminate most of the gun violence, or do you want to keep pushing the same old useless and ineffective ideas? If you genuinely want to reduce it, address the underlying causes. Better mental health screening and treatment. Enforce the current gun laws instead of passing more (that won'tbe enforced either) just so politicians can hold a press conference and pat themselves on the back for "taking a stand" or "doing something." In other words, get the nuts and criminals off the streets. Do something that actually WORKS instead of what just sounds good.