Sure, it could, if developers were perfectly rational entities and if hiring processes at big tech firms where optimal... But neither of these are even remotely true.
The psychological aspects transcend a tool's capabilities. A tool which aims to protect people may in fact cause more harm than it prevents.
Kind of like a gun; great tool for personal protection in the hands of decent people, but put enough of them in the hands of violent criminals and they become a net problem. Human psychology tends to subvert the intent of tools as well as that of laws and regulations, in my experience.
or just not rebuild it at all.
pros: can already be used to buy all things, and doesn't set the earth on fire in order to verify transactions
cons: cannot be used to buy live grenades and CSAM