As someone has already pointed out, cars turning left may well have to stop for other reasons, such as another car in front of them in the side road, a parked car on the opposite side of the side road making an oncoming car move out to pass it, and so on. A lot of frothing about nothing, just clickbait. Besides, cars stop for all sorts of reasons anywhere, so traffic behind should be able, and ready, to stop safely anyway.
As for the nonsense about who should move first*, it's the pedestrian, then the car turning left, then the car turning right. Nothing to see here, move along.
* Has he never been at a mini roundabout with everyone indicating right? Figure it out and stop whingeing.