Tesla's come with a feature called obstacle avoidance or something like that which in theory could have prevented this, although even that isn't a guarantee. It's also a feature that can be enabled/disabled so it's possible it was disabled.

In 2022 they said the feature prevents about 40 incidents a day of people pressing the accelerator down instead of the brake.

Stops you from going into the garage door and other various things.

“Here, I’m showing a particular mode of failure of humans where they accidentally press the accelerator pedal instead of the brake pedal. For example, these people are pressing the accelerator pedal thinking that they’re pressing the brake pedal. But the car realizes that they are doing this and are heading towards a collision and automatically cuts out the acceleration, and presses the brake to prevent the humans from colliding."

Edit: Clarity, but also I think the enable/disable is because it does take control away from the driver, and there could be a theoretical emergency situation where one collision by accelerating away, is better than the other incoming collision? Some people might not want to give up that control? Like if you got a semi about to rear end you at full speed, jumping the curb and hitting a fence is probably the better option.