Oh yeah they don't even care about negative market externalities. In their utopia they think corporations in the beeline pursuit of profit will just naturally be compelled

To that I always ask them who would've voluntarily promoted EPA regulations on vehicles or safety regulations in such a society? Automobile manufacturers didn't want to incorporate them as that changes their bottom-line, requires them to re-tool, and raise prices. Consumers didn't want it either because it would again raise prices while those emission devices reduced vehicle power (my grandpa ripped them off in those early years...).

The only people advocating for such things were scientists and health experts who had the foresight to understand the consequences. That then only came from Democratic institutions mandating such requirements.