You're right, we should ban cars.
Whataboutism is “how dare you complain about our gulags when you treat your black people like slaves.” It is not “our system kills people but it kills fewer people than what we currently have.” Especially when killing people is a result of being on the bleeding edge of what’s possible rather than being a deliberate choice to hurt people.
I believe what you're trying to talk about are excess deaths when a technology is less capable than the incumbent? I'm not sure the stats, but I'd suspect FSD is already superior to the often distracted, sometimes drunk, phone in hand driver that is the norm today.
If chatgpt is to be trusted, Waymo and Tesla FSD are already massively safer than human drivers.