There are 2 criteria to be considered.
1. Distribution of wealth and income - very unbalanced in the USA and absolutely comparable to other violence hot spots like Russia, South Africa, Brazil.
2. Access to fire arms - the USA has it in its constitution.
If you combine both criteria: you get what you have in the USA.
If only one criteria applies, things look much less desperate. Examples: China and UK for fairly high income inequality but very restricted access to fire arms - no violence issue.
Switzerland for easy access to fire arms but much more accepted income distribution.
And then - travel to Scandinavia (with equal income distribution and fire arm restrictions) and you don´t see any police or law enforcement for days and weeks in the streets.