Confirmation bias.
The overall rating is also held by BMW 3 Series, Lexus ES 350, and Mercedes-Benz C-Class (which all rated better in child seat anchors ease of use)...and that's just in the midsize luxury cars category[1].
[1] https://www.iihs.org/ratings/class-summary/midsize-luxury-ca...
You only mentioned IIHS but the Model 3 has been consistent globally on safety test results (Cherry picking?).. Along with NHSTA and IIS in the U.S.
While BMW's crash avoidance systems also failed miserably while the Model 3 aced it the test because of the superior auto emergency braking:
https://twitter.com/tesla_truth/status/1160779803349282818
Tesla Model 3 awarded 5-star ANCAP safety rating in Australia
https://thedriven.io/2019/07/30/tesla-model-3-awarded-5-star...
Model 3 earns 5-Star Safety Rating from Euro NCAP | Tesla
https://www.tesla.com/blog/model-3-earns-5-star-safety-ratin...
The parent made a false assertion (the claim of "highest saftey (sic) rating of any car") while specifically citing IIHS ratings. I corrected this assertion with fact by citing a higher-level IIHS reference. That's not cherry picking...that's proper constraint.
In contrast, you'll have to do a lot better than actual cherry-picked Twitter garbage, blog spam, and self-referencing Telsa press releases.
> Along with NHSTA and IIS in the U.S.
Remind us who IIS is again??
I'll be happy to digest any independent NHTSA OVSC test reports on the subject that you point us towards...coincidentally, I've been shits-and-grins analyzing a bunch of FMVSS 106 and 218 test reports in preparation for next year's racing season, so I suspect they won't put me to sleep...to be sure, not that I really care for Tesla.
TL;DR the Model 3 didn't perform as well with respect to driver-side door hinge pillar intrusion and door sill buckling, contributing to "moderate risk of injury to the left lower leg".
General remarks for Mercedes-Benz C-Class[1] and Lexus ES 350[2]:
> The dummy's position in relation to the door frame, steering wheel, and instrument panel after the crash test indicates that the driver's survival space was maintained well.
> The driver's space was maintained well in both tests, and risk of injuries to the dummy's legs and feet was low.
...as opposed to Tesla Model 3[3]:
> The dummy's position in relation to the door frame, steering wheel, and instrument panel after the crash test indicates that the driver's overall survival space was maintained well, despite moderate intrusion of the lower part of the door hinge pillar and buckling of the door sill.
> Although intrusion overall into the driver's space was minimal, door hinge pillar intrusion contributed to a moderate risk of injury to the left lower leg.
[1] https://www.iihs.org/ratings/vehicle/mercedes-benz/c-class-4...
[2] https://www.iihs.org/ratings/vehicle/lexus/es-350-4-door-sed...
[3] https://www.iihs.org/ratings/vehicle/mercedes-benz/c-class-4...