I agree with you on the "Your story doesn't prove armor saved you?"
But your second argument about him being to blame for the accident... Like sure, you can always be more safe, more alert. But eventually you are gonna make a mistake no matter how much you try not to. And even if you do everything perfectly any number of unexpected things could happen.
"You only got to fuck up once. Be a little slow, be a little late. Just once. And how you ain’t gonna never be slow, never be late? You can’t plan for no shit like this, man. It’s life."
If you want to compare Waymo and Tesla FSD from a technology standpoint and claim superiority of one over the other you can't use simple values like interventions per mile. It says very little. The solutions were designed for different purposes under different constraints. That's what engineers do. If Waymo was attempting to make consumer viable self driving vehicles they would have made very different decisions and likewise for Tesla if their only goal was taxi. That should be obvious to any technologist.