It doesn't though, and it never has, and I'm doubting it ever will. FSD is flawed from the conceptual stage. Roads are complex, constantly changing, and difficult to navigate. Other types of transportation, like rail or air, are trivial to automate in comparison. And then at a hardware level, Tesla also messed up. Pretty much any idiot could've told Tesla that a camera-only system won't work, but here we are.
FSD is a very small step above adaptive cruise control. It's more of a novelty than anything. I certainly wouldn't trust using it, and I don't really care what numbers say either. Tesla doesn't really play fair, being deceptive is a core part of their business. It's no surprise then that FSD auto shuts off right before accidents. We actually have no idea how safe it is, and I'm not going to be listening to what the guy selling them has to say.