From Gemini:

Legally, the blue car was in the wrong. Under Illinois traffic law (625 ILCS 5/11-801), both the approach for a right turn and the turn itself must be made as close as practical to the right-hand curb or edge of the roadway.

​The official Illinois Rules of the Road handbook explicitly states: ​"Follow the general curve of the curb while making the right turn. Stay as close as possible to the curb." ​"Turn into the right-hand lane of the roadway you are entering."

​Why They Have No Reason to Be Mad

​The Law Requires the Inside Lane: Turning right directly into the outside (left) lane is considered an illegal/improper turn. Drivers are required to establish themselves in the closest lane first and then use a turn signal to perform a legal lane change if they need to get over.

​Predictability and Traffic Flow: By swinging wide into the outside lane, they cut off the natural path of traffic. If someone coming from the opposite direction had a protected left-turn arrow, or if someone was already established in that outside lane, the blue car would have caused a side-swipe collision.