Cigarettes, Parecon and Externality
Take the cigarette worker's council in a theoretical American parecon circa 1950. This worker's council begins to discover evidence that their products cause cancer. None of them have any incentive to lie about this fact, as their personal incomes are not tied to net cigarette sales. It is highly unlikely that a parecon would ban cigarettes after such a revelation, and would indeed violate civil rights and thus would be checked by any competent judiciary. But even if it were, it is unimaginable that the cigarette council workers would be so specialized that, either after a reasonable period of training that costs them nothing or no training at all given the general utility of most of their skills, they could not be rehabilitated to work. If they could not, they would be taken care of by society. Further, the scientists council, likely the ones doing the epidemiology, will presumably demand frequent reports and papers from their scientists, so a scientist working for the cigarette council would have little reason to lie, both due to the lack of bribery ability of the worker's council in question and the obvious concerns over reputation and getting paid. And since the whole process is far more transparent, with the "worker bees" having far more say and information (indeed, there are no "worker bees" to contrast against "queen bees"), each individual potential whistleblower has far more impact. And the consumer's council in question can always launch investigations pending complaints, yes, with a law enforcement council of civil servants, and encounter far fewer obstacles of transparency. And those who are externalized upon, whether it be from global warming or similar, have not only judicial redress but also direct economic redress, and since political power is not connected to money as a matter of course, they have as much political say and capacity. Under capitalism, the opposite is true in almost every respect. Cigarette companies squashed data, then when it became too difficult to squash they hired mercenary scientists (who could be doing good work) to defend their interests, put legislators and health industries into their pockets, launched suits against scientists and newspapers who dared to differ, and began a trend of "junk science" questioning of anti-corporate science leading to USSR-like questioning of real science.
Now, the above remains true even if corporations are gone, as managers are still around to muddle the waters of transparency, the workers' success is still linked to sales, scientists and regulatory agencies can still be bought, etc. etc. etc.