This is a behavior we normalize in a driving society. Being assertive as you turn left does nothing to reduce the impact of another car hitting you at 45 miles an hour (or even faster in more rural places).
>A study from the National Highway Traffic Safety Association (NHTSA) shows that turning left is one of the primary causes of automobile collisions. 61 percent of crashes that occur while turning or crossing an intersection involve left turns, as opposed to just 3.1 percent that involve right turns.
>https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/...
https://www.washingtonpost.com/news/innovations/wp/2014/04/0...
Anyway, I'd rather be this type of driver than an overly dense person who doesn't mind backing up traffic. The type of people that will go sideways blocking four lanes coming out of a gas station to get to the turn lane...
I learned to drive in a "defensive" manner. Yes, sometimes non-action can be more dangerous in a specific situation; but feeling bad about backing up traffic doesn't make me a bad driver. Just an socially anxious one.
I agree though, in the original comment, I probably made it sound worse than it actually is for me. I just wish google maps had this option. I would find driving more pleasant.
Edit: I made some edits, to clear up my response
When Ive been a passenger, Ive seen most other drivers feel this way--whether they say it or not, you can see on their face they are feeling anxious.