The main reason is that we refuse to spend money to address the root causes of crime. We won't fix urban poverty or the failing urban education system so most p

The main reason is that we refuse to spend money to address the root causes of crime. We won't fix urban poverty or the failing urban education system so most people choose to live in car-dependent suburban hellholes that make our youth uniquely miserable. Some of them shoot up schools, leading to zero tolerance policies and to moral panic campaigns to ban some inanimate object as the culprit that is supposedly corrupting kids. If we had a functioning safety net and opportunities for people who grow up in the inner city to achieve a better life that doesn't involve playing professional sports, we'd be a mostly urban population like a normal country and we wouldn't have the teen mental health problems that only we have or the school shootings that we've only had for the past 30 years or so of the 400+ years we've had gun rights. We won't do that because that would involve spending our tax dollars for the benefit of people who aren't millionaires, billionaires or corporations.