This statement is either very poorly thought out, or needlessly accusatory and inflammatory.
I would say that if you claim that a massively complex system like public traffic, with thousands of participants, many of them badly or completely untrained, can be organized in such a fashion that any and all accidents can be prevented, the burden falls on you to show how.
This subthread is not about the massively complex system. Rather we are discussing the good judgment of individual drivers. Even if my statement were not literally true (the best kind, and it literally is), it would still be good practice for all drivers to commit themselves to driving slowly enough to prevent collisions with pedestrians.
I would say that if you claim that a massively complex system like public traffic, with thousands of participants, many of them badly or completely untrained, can be organized in such a fashion that any and all accidents can be prevented, the burden falls on you to show how.