In 2019 40% of San Francisco traffic fatalities are from left turns
The closest calls I've ever had with pedestrians were on left turns.  IMO the problem with modern cars is the airbags in the A-pillar.  The pillars have gotten so wide that you have to consciously bob your head around back and forth (like a fighter pilot, of course...) to look around both sides of it.  Otherwise people can easily vanish into that blind spot.  I think a lot of people just forget that there's a big blind spot there because they're used to just looking on either side and inferring what's not visible -- which is usually fine with something as big as a car.  But on a left turn, a pedestrian walking the same direction you are driving can be completely hidden as you turn because their motion will be synchronized with the blind spot.