Driving like idiots compounded by lack of traffic enforcement as police budgets and staffing decline. I just moved away from a pretty decently sized city, and the police there didn't do any traffic enforcement at all. Not enough manpower to cover traffic and crime.

it's not that they don't have the resources, it's that police would rather racially profile people and only perform a traffic stop if they think they can illegally force a search to find or plant drugs.

No, police are very explicitly choosing to not enforce traffic laws.

> failure to use turn signals

Why signal your intentions to your opponent like a chump? They'll just use that information against you to block you from changing lanes, or to duck into a parking lot row ahead of you in a crowded parking lot and steal that empty spot. /s

I've found that drivers vary tremendously in the US. The best average drivers I've been around were in the California Bay Area. Oregon drivers are generally out of it (left lane freeway camping always started the moment I crossed from CA into OR), and only moderately angry. Arizona had wildly incompetent "snow birds" in the winter and insanely aggressive road raging locals in the summer. I've heard that Boston and New Jersey are like Mad Max with potholes.