Don't take my post as a defense of Tesla even if there is blame on both sides here. However, I lay the huge majority of it on Tesla marketing.
I had to find two other articles to figure out if the system being used here was Tesla's free included AutoPilot, or the more advanced paid (one time fee/subscription) version called Full Self Drive (FSD). The answer for this case was: Autopilot.
There are many important distinctions between the two systems. However Tesla frequently conflates the two together when speaking about autonomous technology for their cars, so I blame Tesla. What was required here to avoid these deaths actually has very little to do with autonomous technology as most know it, and instead talking about Collision Avoidance Systems. Only in 2024 was the first talk about requiring Collision Avoidance Systems in new vehicles in the USA. source The cars that include it now (Tesla and some other models from other brands) do so on their own without a legal mandate.
Tesla claims that the Collision Avoidance Systems would have been overridden anyway because the driver was holding on the accelerator (which is not normal under Autopilot or FSD conditions). Even if that's true, Tesla has positioned its cars as being highly autonomous, and often times doesn't call out that that skilled autonomy only comes in the Full Self Drive paid upgrade or subscription.
So I DO blame Tesla, even if the driver contributed to the accident.