Unaccounted externalities aren't a 'market failure', they are exactly what the market is optimizing for. even if you could ever get support for the accounting y

Unaccounted externalities aren't a 'market failure', they are exactly what the market is optimizing for. even if you could ever get support for the accounting you propose (you wouldn't, as no popular politician will truly sacrifice for it), you'd still be fighting the 'creativity' of the market to find exploitable loopholes in ever escalating ways.