Sure there could be infinite reasons why some things happen and some dont, but everything you are talking about here are hypothetical scenarios, I am providing a mathematical fact that the US has more gun related deaths than other countries.  If your goal is to reduce gun related deaths in the USA than the logical thing to do is look at what other countries are doing who do not have as many gun related deaths.  If you are fine with the amount of gun related deaths in the USA than nothing needs to change.


https://www.vox.com/policy-and-politics/2017/10/2/16399418/us-gun-violence-statistics-maps-charts

This is something that should be decided by democracy, if the majority of the population wants more/less laws that is what should happen because that is how democracy works (unfortunately democracy does not work when gov politicians have been bought and paid for).

You keep bringing up Chicago as having tough gun control laws, I am not sure where you are getting this information from, but that is not true at all http://www.baltimoresun.com/news/opinion/editorial/bs-ed-1006-alternative-fact-20171005-story.html the only difference in Chicago is that Cook County has a ban on assault weapons, but you can drive an hour in any directions out of Chicago and buy an assault weapon.  Every other law is the same as other cities.