The toes over the curb thing is a potential collision threat. It's fine to statistically categorize and prioritize these, as they're everywhere. But as soon as it becomes an imminent threat (i.e. is directly in the vehicle's path), avoiding the collision should immediately become the overriding objective. If the collision is truly unavoidable (this should very rarely be the case with an AV), then it should still be slamming on the breaks and doing everything possible to lessen the force of the impact.